best low impact exercise

for those who have not exercised for a looooong time (like me), the best low impact, yet high result exercise i highly recommend is yoga or pilates.
it's not as easy as it looks, but if done correctly, the result is way better that pumping in the gym. not only it stretches those muscles, it also strengthens them from the inside-out. pumping all those equipment only strengthens the muscles from the outside-in.
i love doing the pilates exercise. after just one session, i can feel myself all stretched out. another thing is pilates makes you more graceful. found out that ballet dancers enhance their flexibility and stamina by the pilates method of exercise.
tomorrow will attend one of the classes above. after over a year, just hope the strength is still there to maintain a decent pose (,")