Our bodies were designed thousands of years ago before the computer, the auto and for example resistance or cardiovascular equipment. Whenever I look at an exercise I try not to be suffering with dogma. Exercises are simply resistance applied towards the musculo-skeletal application. Whether it's Yoga, Pilates, Boxing, body-building, Spinning or whatever, it is always prudent assess the risk or harness an exercise based on joint structure, function you will also and during which the resistance i...