diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Activite.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
similarity index 90%
rename from back_end/src/main/java/hackathon/FrisbYEE/jpa/Activite.java
rename to back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
index 8b7343c..a0d84e0 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Activite.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
@@ -1,4 +1,4 @@
-package hackathon.FrisbYEE.jpa;
+package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
@@ -6,13 +6,11 @@ import jakarta.persistence.ManyToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
-
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 import jakarta.persistence.Access;
 import jakarta.persistence.AccessType;
-import jakarta.persistence.CascadeType;
 import jakarta.persistence.ElementCollection;
 import jakarta.persistence.Entity;
 
@@ -31,7 +29,7 @@ public class Activite implements Serializable {
     @ElementCollection
     private List<String> dataActivite = new ArrayList<>();    
 
-    @ManyToOne(cascade = CascadeType.PERSIST)
+    @ManyToOne
     private Session session;
 
     public Activite(String name) {
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Admin.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
similarity index 93%
rename from back_end/src/main/java/hackathon/FrisbYEE/jpa/Admin.java
rename to back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
index fdb77fe..ddacacc 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Admin.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
@@ -1,4 +1,4 @@
-package hackathon.FrisbYEE.jpa;
+package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Athlete.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
similarity index 65%
rename from back_end/src/main/java/hackathon/FrisbYEE/jpa/Athlete.java
rename to back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
index fd5b2ac..42235e4 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Athlete.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
@@ -1,4 +1,4 @@
-package hackathon.FrisbYEE.jpa;
+package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
@@ -10,6 +10,7 @@ import java.util.ArrayList;
 import java.util.List;
 import jakarta.persistence.Access;
 import jakarta.persistence.AccessType;
+import jakarta.persistence.ElementCollection;
 import jakarta.persistence.Entity;
 
 @Entity
@@ -22,13 +23,26 @@ public class Athlete {
     @GeneratedValue
     private Long id;
     private String name;
+    private String categorie;
+    private String niveau;
+    @ElementCollection
+    private List<String> groupe = new ArrayList<>();
 
+    
     @ManyToMany(mappedBy = "athletes")
     private List<Session> sessions = new ArrayList<>(); // plusieurs sessions sont possibles
 
     public Athlete(String name){
         this.name = name;
     }
+
+    public Athlete(String name, String categorie, String niveau, List<String> groupe){
+        this.name = name;
+        this.categorie = categorie;
+        this.niveau = niveau;
+        this.groupe = groupe;
+    }
+
     @Override
     public String toString() {
         return "Athlete [id=" + id + " , name=" + name + "]";
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Coach.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
similarity index 84%
rename from back_end/src/main/java/hackathon/FrisbYEE/jpa/Coach.java
rename to back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
index ed820b2..6294ab9 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Coach.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
@@ -1,4 +1,4 @@
-package hackathon.FrisbYEE.jpa;
+package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
@@ -10,7 +10,6 @@ import java.util.ArrayList;
 import java.util.List;
 import jakarta.persistence.Access;
 import jakarta.persistence.AccessType;
-import jakarta.persistence.CascadeType;
 import jakarta.persistence.Entity;
 
 @Entity
@@ -24,7 +23,7 @@ public class Coach {
     private Long id;
     private String name;
 
-    @OneToMany(mappedBy = "session", cascade = CascadeType.PERSIST)
+    @OneToMany(mappedBy = "coach")
     private List<Session> sessions = new ArrayList<>(); // Un coach peut avoir plusieurs sessions
 
     public Coach(String name){
@@ -34,4 +33,4 @@ public class Coach {
     public String toString() {
         return "Coach [id=" + id + " , name=" + name + "]";
     }
-}
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Session.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
similarity index 92%
rename from back_end/src/main/java/hackathon/FrisbYEE/jpa/Session.java
rename to back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
index d77c880..f7d565e 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/Session.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
@@ -1,4 +1,4 @@
-package hackathon.FrisbYEE.jpa;
+package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
@@ -31,10 +31,10 @@ public class Session {
     private Long duree;
     private String groupe;
 
-    @ManyToOne(cascade = CascadeType.PERSIST)
+    @ManyToOne
     private Coach coach; // un coach par session
 
-    @ManyToMany(cascade = CascadeType.PERSIST)
+    @ManyToMany
     private List<Athlete> athletes = new ArrayList<>(); // plusieurs athlètes par session
 
     @OneToMany(mappedBy = "session", cascade = CascadeType.PERSIST)
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java
new file mode 100644
index 0000000..b238e75
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java
@@ -0,0 +1,8 @@
+package hackathon.FrisbYEE.jpa.service;
+
+import hackathon.FrisbYEE.jpa.metier.Activite;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ActiviteDAO extends JpaRepository<Activite, Integer>  {
+    Activite findByKeycloakId(String keycloakId);
+}
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java
new file mode 100644
index 0000000..9a352a3
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java
@@ -0,0 +1,9 @@
+package hackathon.FrisbYEE.jpa.service;
+
+import hackathon.FrisbYEE.jpa.metier.Activite;
+import hackathon.FrisbYEE.jpa.metier.Athlete;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface AthleteDAO extends JpaRepository<Athlete, Integer> {
+}
+
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
new file mode 100644
index 0000000..fe16ff9
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
@@ -0,0 +1,4 @@
+package hackathon.FrisbYEE.jpa.service;
+
+public class CoachDAO {
+}
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/web/ActiviteController.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/web/ActiviteController.java
new file mode 100644
index 0000000..9557bef
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/web/ActiviteController.java
@@ -0,0 +1,11 @@
+package hackathon.FrisbYEE.jpa.web;
+
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+@RequestMapping("/activite")
+
+public class ActiviteController {
+}