diff --git a/cara/apps/calculator/static/js/form.js b/cara/apps/calculator/static/js/form.js
index ef5f29d8..971b9ba6 100644
--- a/cara/apps/calculator/static/js/form.js
+++ b/cara/apps/calculator/static/js/form.js
@@ -153,7 +153,17 @@ function require_hepa(option) {
 }
 
 function setMaxInfectedPeople() {
-  $("#infected_people").attr("max", $("#total_people").val());
+
+  $("#training_limit_error").hide();
+  var max = $("#total_people").val()
+
+  if ($("#activity_type").val() === "training")
+  {
+    max = 1;
+    $("#training_limit_error").show();
+  }
+
+  $("#infected_people").attr("max", max);
 }
 
 /* -------UI------- */
@@ -251,6 +261,8 @@ $(document).ready(function () {
   setMaxInfectedPeople();
   $("#total_people").change(setMaxInfectedPeople);
 
+  $("#activity_type").change(setMaxInfectedPeople);
+
   var radioValue = $("input[name='event_type']:checked");
   if (radioValue.val()) {
     require_fields(radioValue.get(0));
diff --git a/cara/apps/calculator/templates/calculator.form.html.j2 b/cara/apps/calculator/templates/calculator.form.html.j2
index 7d9ddb85..83b0eb0c 100644
--- a/cara/apps/calculator/templates/calculator.form.html.j2
+++ b/cara/apps/calculator/templates/calculator.form.html.j2
@@ -106,6 +106,7 @@
     </div><br>
     Total number of occupants: <input type="number" id="total_people" name="total_people" min=1 required><br>
     Number of infected people: <input type="number" id="infected_people" name="infected_people" min=1 required><br>
+    <span id="training_limit_error" class="red_text" hidden>Training activities limited to 1 infected</span><br>
     <hr width="80%">
 
     Activity type: <select id="activity_type" name="activity_type">