I didn't take the survey, but I have done Pilates (not too much this year...). It can be incredibly intensive. You need to find a good instructor who has had the proper training. The certification to be a Pilates instructor is quite rigorous. I saw major good changes in my body from it; lengthening, muscular strength. I have been weight training for the past 4 months, with a trainer and while I am definitely stronger, I don't see the same kinds of changes as i did from Pilates. I tried Yoga once and hated it. Too "meditative/spiritual" for me. I walk, hike, cross country ski, and do spin (in the winter for the last one). Last year I tried running, which dropped the pounds, but made me very sore for cycling. I couldn't improve much past a 10 minute mile, which sucks. So, I am pretty much going to give that up. I did aerobics and step for about 20 years, ten as an instructor. I haven't been to a class in about a year and a half, but once in awhile I think about going back. I just like being outside too much, so except for things that you have to do in a gym, I prefer that.