Hero image demonstrating PinPic interactive hotspots: muscle groups engaged during a beach volleyball spike.
The anterior deltoid generates the shoulder flexion and overhead reach that positions the hand to contact the ball during the spike
The biceps brachii assists elbow stabilization and helps control the forearm during the final swing to direct the spike
The external oblique rotates and laterally flexes the trunk to produce the torso twist that increases arm swing power and reach
The gluteus maximus provides explosive hip extension to drive upward momentum and transfer force from the legs into the spike
The quadriceps extend the knee to generate the vertical jump and stabilize the landing after the spike
The gastrocnemius plantarflexes the ankle to add push-off power during the jump and control the foot strike in sand