def add_plan(self, plan: ExercisePlan):
    for objects in self.plans:
        if (objects.id == plan.id):
            return
    self.plans.append(plan)
def add_plan(self, plan: ExercisePlan):
    for objects in self.plans:
        if (objects.id == plan.id):
            return
    self.plans.append(plan)