@fifatrainingcentre: Tony Colbert: Open side plank with arm and hip flexion/extension Muscle group activation 🟡 Hip abductors; adductor; flexors; extensors; spinal extensors stabilisers and rotators; transverse abdominal; and obliques Execution 🟡 Adopt a straight and elongated high-lift posture as you bring your elbow to your knee and then your knee to your elbow before extending to a fully straight position with your legs held wide apart. Progression or new exercise 🟡 This new progression of the side plank demands very strong coordination of the core and hip muscles to perform the exercise with the required stability.