Bicycle Crunch Joint Actions
Agonist or prime mover is the rectus abdominus muscle.
Bicycle crunch joint actions. Lie on your back lift your shoulders off the mat and raise both legs. How to do a bicycle crunch. Repeat until the set is complete. Bring one knee and the opposing elbow close to each other by crunching to one side and fully extend the other leg.
During biceps curls for example only your elbow joints are moving. Torso flexion and vertebral flexion are mean the same thing. Return to the starting position and then crunch to the opposite side. The joint action during the concentric phase of a crunch is spine flexion.
However lat pulldowns require movement at the shoulders and elbows and is thus not considered a single joint activity. Once at the top rom hold for one second maximally contract the abdominals and slowly lower to the floor again. Bicycle crunches are a great way to target the rectus abdominis the six pack muscles and the obliques in one easy exercise. Then through contracting the abdominals raise the right shoulders from the ground and crunch across to tap the left knee with the right elbow or as close as you can.
The bicycle crunch works both the rectus abdominus and obliques while most ab exercises work either one or the other. The rectus abdominis attaches to the ribs and pelvis and crosses over the front of the abdomen.