My wife badgered, cajoled and pleaded with me for two years about going to her hot yoga classes with her. We are both active and do some kind of exercise 5-6 times a week. I'm in my 60's and it seemed pointless to me to go to a class with a bunch of 20 something girls (except for the eye candy).
About nine months ago, we came to an agreement where we both got what we wanted and I went with her to the first class. It was a Hatha yoga class. It was hot, sweaty and somewhat difficult. However, after a few classes I was feeling more flexible so I kept it up. At about three months in I started to enjoy it and I have better balance and flexibility because of the classes.
Something strange has happened along the way. More and more men are showing up. Most of the men are 50+, up to about 80 years old. The last class I went to was 75% men, all but two of whom were older than 50. As we age, I think we lose balance and flexibility faster than we lose strength. Maybe that's why more old guys are starting to get into yoga.
I don't think you will think the first class is much fun, but hang in for a few more. It will get easier and you will feel better. Oh, and I don't wear yoga pants, just synthetic running shorts and a synthethic t shirt. Don't wear cotton, it holds too much sweat!
Lyle