I like to do specific warm ups for specific individual sessions. If doing a straight line speed and/or acceleration day I will have a warm up for that. If I am doing a change of direction session I will have a warm up for that (shown here) Whilst all muscle groups and joints will be warmed up in both versions - the change of direction day spends a bit more time preparing the groin area / hip muscles and joints for moving side to side and pushing off inside edge and outside edge of the foot. With all warm ups, you can follow a simple format of RAMP R = raise body temperature (easy low intensity movements to improve blood flow can be with or without ball) A = activation (prepare hips, core muscles, shoulders, glutes etc..) M = mobility (joint range of motion) P = potentiation (short sprint, hurdle jump, shuffle, "fast feet" co-ordination)