diff --git a/gym/models.py b/gym/models.py
index b1c329f..cd18ada 100644
--- a/gym/models.py
+++ b/gym/models.py
@@ -31,7 +31,7 @@ class Equipment(models.Model):
 
     @property
     def last_theoretical_max(self):
-        return self.theoretical_maxs.order_by('-start').first()
+        return self.theoretical_maxs.order_by('-date').first()
 
     def __str__(self):
         return f'{self.name} ({self.room.name})'
diff --git a/gym/templates/gym/equipment.html b/gym/templates/gym/equipment.html
index f6a93cf..67d05f9 100644
--- a/gym/templates/gym/equipment.html
+++ b/gym/templates/gym/equipment.html
@@ -8,8 +8,14 @@
     </div>
     <div class="row">
         <div class="col-12">
-            <a href="{% url 'room-detail' equipment.room.pk %}" class="btn btn-secondary">Retourner à la salle</a>
-            <a href="{% url 'setting-create' %}?equipment={{ equipment.pk }}" class="btn btn-success">Ajouter un réglage</a>
+            <a href="{% url 'room-detail' equipment.room.pk %}"
+               class="btn btn-secondary">Retourner à la salle</a>
+            <a href="{% url 'setting-create' %}?equipment={{ equipment.pk }}"
+               class="btn btn-success">Ajouter un réglage</a>
+            {% if session %}
+                <a href="{% url 'round-create' %}?equipment={{ equipment.pk }}&session={{ session.pk }}"
+                   class="btn btn-success">Commencer une série</a>
+            {% endif %}
         </div>
     </div>
     <div class="row">
diff --git a/gym/templates/gym/round_edit.html b/gym/templates/gym/round_edit.html
new file mode 100644
index 0000000..c950846
--- /dev/null
+++ b/gym/templates/gym/round_edit.html
@@ -0,0 +1,31 @@
+{% extends 'gym/base.html' %}
+{% load bootstrap4 %}
+
+{% block content %}
+    <div class="row">
+        <div class="col-12">
+            <h1>{% block title %}{{ title }} une série{% endblock %}</h1>
+        </div>
+    </div>
+    <div class="row">
+        <div class="col-12">
+            {% if equipment %}
+                <a href="{% url 'equipment-detail' equipment.pk %}" class="btn btn-secondary">Retourner à la machine</a>
+            {% endif %}
+        </div>
+    </div>
+    <div class="row">
+        <div class="col-12">
+            <form action="" method="post">
+                {% csrf_token %}
+                {% bootstrap_form form %}
+                {% buttons %}
+                    <button type="submit" class="btn btn-success">Valider</button>
+                    {% if edit %}
+                        <a href="{% url 'setting-delete' setting.pk %}" class="btn btn-danger">Supprimer</a>
+                    {% endif %}
+                {% endbuttons %}
+            </form>
+        </div>
+    </div>
+{% endblock %}
\ No newline at end of file
diff --git a/gym/templates/gym/session_detail.html b/gym/templates/gym/session_detail.html
index 4ddf0e5..7ce476c 100644
--- a/gym/templates/gym/session_detail.html
+++ b/gym/templates/gym/session_detail.html
@@ -34,7 +34,7 @@
             <h2>Machines</h2>
             <ul class="list-group">
                 {% for equipment in session.room.equipments.all %}
-                    <a href="{% url 'equipment-detail' equipment.pk %}" class="list-group-item">{{ equipment.name }}</a>
+                    <a href="{% url 'equipment-detail' equipment.pk %}?session={{ session.pk }}" class="list-group-item">{{ equipment.name }}</a>
                 {% endfor %}
             </ul>
         </div>
diff --git a/gym/urls.py b/gym/urls.py
index 11ce67d..a050973 100644
--- a/gym/urls.py
+++ b/gym/urls.py
@@ -14,6 +14,7 @@ urlpatterns = [
     path('setting/<int:pk>/delete', views.SettingDeleteView.as_view(), name='setting-delete'),
     path('session/start/', views.SessionCreateView.as_view(), name='session-start'),
     path('session/<int:pk>/', views.SessionDetailView.as_view(), name='session-detail'),
+    path('round/add/', views.RoundCreateView.as_view(), name='round-create'),
     # path('session/<int:pk>/delete', views.SessionDeleteView.as_view(), name='session-delete'),
 ]
 
diff --git a/gym/views.py b/gym/views.py
index 9ebcdfd..e096e83 100644
--- a/gym/views.py
+++ b/gym/views.py
@@ -4,7 +4,7 @@ from django.shortcuts import get_object_or_404
 from django.urls import reverse
 from django.views import generic
 
-from gym.models import Room, Equipment, Setting, Session
+from gym.models import Room, Equipment, Setting, Session, Round
 
 
 class RoomListView(generic.ListView):
@@ -23,6 +23,19 @@ class EquipmentDetailView(generic.DetailView):
     model = Equipment
     context_object_name = 'equipment'
     template_name = 'gym/equipment.html'
+    session = None
+
+    def dispatch(self, request, *args, **kwargs):
+        default_session_id = self.request.GET.get('session')
+        if default_session_id:
+            self.session = get_object_or_404(Room, pk=default_session_id)
+
+        return super().dispatch(request, *args, **kwargs)
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context['session'] = self.session
+        return context
 
 
 class EquipmentCreateView(generic.CreateView):
@@ -133,3 +146,42 @@ class SessionDetailView(generic.DetailView):
     model = Session
     context_object_name = 'session'
     template_name = 'gym/session_detail.html'
+
+
+class RoundCreateView(generic.CreateView):
+    model = Round
+    fields = ['equipment', 'session', 'theoretical_max_percentage', 'chosen_weight', 'notes']
+    template_name = 'gym/round_edit.html'
+    equipment = None
+    session = None
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context['title'] = 'Commencer'
+        context['equipment'] = self.equipment
+        context['session'] = self.session
+        return context
+
+    def dispatch(self, request, *args, **kwargs):
+        self.equipment = get_object_or_404(Equipment, pk=self.request.GET.get('equipment'))
+        self.session = get_object_or_404(Equipment, pk=self.request.GET.get('session'))
+
+        return super().dispatch(request, *args, **kwargs)
+
+    def get_initial(self):
+        theoretical_max_percentage = 65
+        initial = super().get_initial()
+        initial['equipment'] = self.equipment
+        initial['session'] = self.session
+        initial['repetition_number'] = 3
+        initial['theoretical_max_percentage'] = theoretical_max_percentage
+        proposed_weight = 0
+        theoretical_max = self.equipment.last_theoretical_max
+        if theoretical_max:
+            proposed_weight = theoretical_max.value * theoretical_max_percentage / 100
+        initial['chosen_weight'] = proposed_weight
+
+        return initial
+
+    def get_success_url(self):
+        return reverse('equipment-detail', kwargs={'pk': self.object.equipment.pk})