Pilates, yoga, and gyrotronics
I have studied all three, and they are very similar. A lot depends on the teacher also. All three focus on using the human body properly, and efficiently, and getting rid of bad habits (which everyone develops over time).
Yoga, depending on the type of yoga, also focuses on the mental connection between mind and body and is good for reducing stress. Breathing is also stressed.
Pilates is like "western-ized" yoga, in that it approaches it from a biological and medical perspective, less mental, and focuses more on strengthening the "core", or torso muscles, which includes the abdomen and back muscles. There are mat exercises which require no equipment, then there are exercises that include a ring, a ball, or a bench, then there are large, expensive pieces of equipment (such as the cadillac and the reformer).
Gyrotronics uses a machine with pulleys and gears to give resistance to the motions included in yoga and pilates. It focuses on fluid motion, not "up and down" type motions like weight lifting, and incorporates breathing and the "core" muscles in all exercises.
They all reduce stress and are great for posture and avoiding or improving back problems. I think Pilates is best for improving abdominal strength, but good instructors will focus on that in all three.
Hope that helps.
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