------------- This movement is the time-tested standard for building overall calf mass, particularly the gastrocnemius area. To perform this movement, fix your shoulders underneath the pads of the machine and stand with the balls of your feet on the calf block below about shoulder width apart. Stand with straight legs and just a slight bend in the knees to relieve the tension on that joint. The knees should stay in this semi-locked position throughout the motion. Descend by lowering your heels toward the ground slowly. Once you have reached full range of motion and feel a deep stretch in the calves, reverse the motion and come up on the balls of your feet and contract the muscle as much as possible. Important note: When coming up on the balls of your feet, do not try to flex your toes - let the foot do the movement. Also, DO NOT bounce the weight at the bottom or do a bouncing motion throughout the movement.
------------- The specialized cells of the cardiac conduction system arise from myocardial precursor cells. The mature cells have relatively poor contractility and express specialized ion channels and