To maximize the strength of the sternocleidomastoid and its associated jaw musculature perform this exercise in a seated position; using a 4 Way or 5 Way Neck Machine.
Training the extrinsic and intrinsic muscle of the hand as well as the elbow flexors is a good thing.
Having a powerful grip will change an athlete's performance at many levels and should be something strived for
They determined that by adding open- kinetic chain exercise to rhabilitation after ACL reconstruction resulted in a significantly better improvement in quadriceps torque without reducing knee joint stability.
Do 100 reps of each exercise each workout. Start with the appropriate weight from your last workout.