diff --git a/cara/apps/calculator/README.md b/cara/apps/calculator/README.md
index 43b46337..8450d166 100644
--- a/cara/apps/calculator/README.md
+++ b/cara/apps/calculator/README.md
@@ -103,12 +103,16 @@ There are three predefined activities in the tool at present.
 
 **Call Centre** = All persons seated, all talking simultaneously, all the time. This is a conservative profile (i.e. will show in increased ``P(i)`` compared to office/meeting) if used for office activity.
 
-**Workshop** = Based on a mechanical assembly workshop, all persons are standing and talking 50% of the time. Everyone (occupants and infected occupants) is treated the same in this model.
+**Lab** = Based on a typical lab or technical working area, all persons are doing light activity and talking 50% of the time. Everyone (occupants and infected occupants) is treated the same in this model.
+
+**Workshop** = Based on a mechanical assembly workshop or equipment installation scenario, all persons are doing moderate activity and talking 50% of the time. Everyone (occupants and infected occupants) is treated the same in this model. This model is equally applicable to bicycling, or walking on a gradient, in the LHC tunnels.
 
 **Training** = Based on a typical training course scenario.
-One individual (the trainer) is doing light exercise (standing) and talking, with all other individuals seated and talking quietly (whispering).
-In this case it is assumed that the infected person is the trainer, because this is the worst case in terms of viral sheeding.
+One individual (the trainer) is standing and talking, with all other individuals seated and talking quietly (whispering).
+In this case it is assumed that the infected person is the trainer, because this is the worst case in terms of viral sheding.
  
+**Gym** = Included for comparison purposes only, all persons are doing heavy exercise and breathing (no talking). Everyone (occupants and infected occupants) is treated the same in this model.
+
 
 ### Timings
 
diff --git a/cara/apps/calculator/model_generator.py b/cara/apps/calculator/model_generator.py
index be46e37b..57f1301a 100644
--- a/cara/apps/calculator/model_generator.py
+++ b/cara/apps/calculator/model_generator.py
@@ -186,10 +186,15 @@ class FormData:
             ),
             'callcentre': ('Seated', 'Talking'),
             'training': ('Standing', 'Talking'),
+            'lab': (
+                'Light activity',
+                #Model 1/2 of time spent talking in a lab.
+                {'Talking': 1, 'Breathing': 1}),
             'workshop': (
-                'Standing',
+                'Moderate activity',
                 #Model 1/2 of time spent talking in a workshop.
-                {'Talking': 1, 'Breathing': 1})
+                {'Talking': 1, 'Breathing': 1}),
+            'gym':('Heavy exercise', 'Breathing'),
         }
 
         [activity_defn, expiration_defn] = scenario_activity_and_expiration[self.activity_type]
@@ -214,7 +219,9 @@ class FormData:
             'meeting': 'Seated',
             'callcentre': 'Seated',
             'training': 'Seated',
-            'workshop': 'Standing',
+            'workshop': 'Moderate activity',
+            'lab':'Light activity',
+            'gym':'Heavy exercise',
         }
 
         activity_defn = scenario_activity[self.activity_type]
@@ -391,7 +398,7 @@ def baseline_raw_form_data():
     }
 
 
-ACTIVITY_TYPES = {'office', 'meeting', 'training', 'callcentre', 'workshop'}
+ACTIVITY_TYPES = {'office', 'meeting', 'training', 'callcentre', 'workshop', 'lab', 'gym'}
 EVENT_TYPES = {'single_event', 'recurrent_event'}
 MECHANICAL_VENTILATION_TYPES = {'air_changes', 'air_supply', 'not-applicable'}
 MASK_TYPES = {'Type I', 'FFP2'}
diff --git a/cara/apps/calculator/templates/calculator.form.html.j2 b/cara/apps/calculator/templates/calculator.form.html.j2
index cfebb470..a28fb5a8 100644
--- a/cara/apps/calculator/templates/calculator.form.html.j2
+++ b/cara/apps/calculator/templates/calculator.form.html.j2
@@ -113,9 +113,11 @@
                     <option value="office">Office</option>
                     <option value="meeting">Meeting</option>
                     <option value="callcentre">Call Centre</option>
+                    <option value="lab">Laboratory</option>
                     <option value="workshop">Workshop</option>
                     <option value="training">Training</option>
-                   </select><br>
+                    <option value="gym">Gym</option>
+                  </select><br>
     Start: <input type="time" id="activity_start" class="start_time" name="activity_start" value="09:00" required> &nbsp;&nbsp;
     Finish: <input type="time" id="activity_finish" class="finish_time" name="activity_finish" value="18:00" required>
     <span id="activity_time_error" class="red_text" hidden>Finish time must be after start</span><br>
@@ -208,11 +210,13 @@
   <b>Activity types:</b><br>
   The type of activity that includes both the infected and exposed persons:
   <ul>
-    <li>Office = typical scenario all persons seated, in conversation (talking 33% of the time, otherwise breathing normally).</li>
-    <li>Meeting = typical scenario all persons seated, in conversation (talking time is shared equally between all persons).</li>
-    <li>Workshop = assembly workshop environment, all persons standing, talking (50% of the time spent talking).</li>
+    <li>Office = Typical office scenario with all persons seated, in conversation (talking 33% of the time, otherwise breathing normally).</li>
+    <li>Meeting = Typical meeting scenario with all persons seated, in conversation (talking time is shared equally between all persons).</li>
     <li>Call Centre = A conservative assumption for office spaces, assumes all occupants are seated and talking continuously.</li>
-    <li>Training = one person (the trainer) standing, talking, all others seated, talking quietly (whispering). It is assumed the trainer is the infected person, for the worst case scenario.</li>
+    <li>Laboratory =  Typical lab scenario with all persons doing light physical activity and talking 50% of the time.</li>
+    <li>Workshop = Typical mechanical assembly workshop or equipment installation scenario with all persons doing moderate activity and talking 50% of the time.</li>
+    <li>Training = Training course scenario. One person (Trainer) standing, talking, all others seated, talking quietly (whispering). It is assumed the Trainer is the infected person, for the worst case scenario.</li>
+    <li>Gym = Included for comparison purposes only, all persons are doing heavy exercise and breathing (no talking).</li>
   </ul>
   <b>Activity breaks:</b><br>
   <ul>
diff --git a/cara/apps/calculator/templates/report.html.j2 b/cara/apps/calculator/templates/report.html.j2
index 203569b0..61d3d606 100644
--- a/cara/apps/calculator/templates/report.html.j2
+++ b/cara/apps/calculator/templates/report.html.j2
@@ -76,9 +76,13 @@
 		{% elif form.activity_type == "callcentre" %}
 		Call Centre = typical office scenario with all persons seated, all talking continuously.
 		{% elif form.activity_type == "workshop" %}
-		Workshop = assembly workshop environment, all persons standing, talking 50% of the time.
+		Workshop = assembly workshop environment, all persons doing moderate physical activity, talking 50% of the time.
 		{% elif form.activity_type == "training" %}
 		Training – one person (the trainer) standing, talking, all others seated, talking quietly (whispering). It is assumed the trainer is the infected person, for the worst case scenario.
+		{% elif form.activity_type == "lab" %}
+		Laboratory = Lab or technical environment, all persons doing light physical activity, talking 50% of the time.
+		{% elif form.activity_type == "gym" %}
+		Gym = For comparison only, all persons doing heavy physical exercise, breathing and not talking.
 		{% endif %}
 		</p></li>
 			<ul>
diff --git a/cara/apps/expert.py b/cara/apps/expert.py
index 60fcfee9..410e9127 100644
--- a/cara/apps/expert.py
+++ b/cara/apps/expert.py
@@ -369,14 +369,14 @@ baseline_model = models.ExposureModel(
             virus=models.Virus.types['SARS_CoV_2'],
             presence=models.SpecificInterval(((8, 12), (13, 17))),
             mask=models.Mask.types['No mask'],
-            activity=models.Activity.types['Light exercise'],
+            activity=models.Activity.types['Light activity'],
             expiration=models.Expiration.types['Unmodulated Vocalization'],
         ),
     ),
     exposed=models.Population(
         number=10,
         presence=models.SpecificInterval(((8, 12), (13, 17))),
-        activity=models.Activity.types['Light exercise'],
+        activity=models.Activity.types['Light activity'],
         mask=models.Mask.types['No mask'],
     ),
 )
diff --git a/cara/models.py b/cara/models.py
index 4bfe8ece..232cbb5a 100644
--- a/cara/models.py
+++ b/cara/models.py
@@ -392,8 +392,8 @@ class Activity:
 Activity.types = {
     'Seated': Activity(0.51, 0.51),
     'Standing': Activity(0.57, 0.57),
-    'Light exercise': Activity(1.38, 1.38),
-    'Moderate exercise': Activity(2.35, 2.35),
+    'Light activity': Activity(1.25, 1.25),
+    'Moderate activity': Activity(1.78, 1.78),
     'Heavy exercise': Activity(3.30, 3.30),
 }
 
diff --git a/cara/tests/test_known_quantities.py b/cara/tests/test_known_quantities.py
index 7118897b..3c40f902 100644
--- a/cara/tests/test_known_quantities.py
+++ b/cara/tests/test_known_quantities.py
@@ -79,7 +79,7 @@ def build_model(interval_duration):
             virus=models.Virus.types['SARS_CoV_2'],
             presence=models.SpecificInterval(((0, 4), (5, 8))),
             mask=models.Mask.types['No mask'],
-            activity=models.Activity.types['Light exercise'],
+            activity=models.Activity.types['Light activity'],
             expiration=models.Expiration.types['Unmodulated Vocalization'],
         ),
     )
@@ -300,7 +300,7 @@ def build_hourly_dependent_model(month, intervals_open=((7.5, 8.5),),
             virus=models.Virus.types['SARS_CoV_2'],
             presence=models.SpecificInterval(intervals_presence_infected),
             mask=models.Mask.types['No mask'],
-            activity=models.Activity.types['Light exercise'],
+            activity=models.Activity.types['Light activity'],
             expiration=models.Expiration.types['Unmodulated Vocalization'],
         ),
     )
@@ -321,7 +321,7 @@ def build_constant_temp_model(outside_temp, intervals_open=((7.5, 8.5),)):
             virus=models.Virus.types['SARS_CoV_2'],
             presence=models.SpecificInterval(((0, 4), (5, 7.5))),
             mask=models.Mask.types['No mask'],
-            activity=models.Activity.types['Light exercise'],
+            activity=models.Activity.types['Light activity'],
             expiration=models.Expiration.types['Unmodulated Vocalization'],
         ),
     )
@@ -348,7 +348,7 @@ def build_hourly_dependent_model_multipleventilation(month, intervals_open=((7.5
             virus=models.Virus.types['SARS_CoV_2'],
             presence=models.SpecificInterval(((0, 4), (5, 7.5))),
             mask=models.Mask.types['No mask'],
-            activity=models.Activity.types['Light exercise'],
+            activity=models.Activity.types['Light activity'],
             expiration=models.Expiration.types['Unmodulated Vocalization'],
         ),
     )
@@ -364,7 +364,7 @@ def build_hourly_dependent_model_multipleventilation(month, intervals_open=((7.5
     [0.5, 1.2, 2., 3.5, 5., 6.5, 7.5, 7.9, 8.],
 )
 def test_concentrations_hourly_dep_temp_vs_constant(month, temperatures, time):
-    # The concentrations should be the same up to 8 AM (time when the 
+    # The concentrations should be the same up to 8 AM (time when the
     # temperature changes DURING the window opening).
     m1 = build_hourly_dependent_model(month)
     m2 = build_constant_temp_model(temperatures[7]+273.15)