I bought a DENISE AUSTIN video for Pilates at a yardsale for $1 and brought it home thinking I might try it, as I like YOGA. My dd, Maggie, who is 17 did the workout and she said to me later "WOW, Mom, Denise really made that hard. I almost didn't get through it." This is from a 17 yo who is 5'8" and 133# and can run 2 miles. To say the least, I didn't bother trying it at the present time.
I suggest getting a YOGA video from PRISCILLA PATRICK who is 65 yo and taught on PBS. www.yogaone.com