Any thing like that is a lot a lot better in person.  Particularly if you want to get better at it in addition to just getting in better shape.  A lot of stuff is about form.  It helps a lot to have someone around to tell you what you're doing wrong.  Often it's little things like switching your hips or pivoting on a back foot.

If there is a community college near you maybe try signing up for a karate class...if it's cheap.  They often have a lot more variance in regard to age and shape and all of that.  I took one once and it had folks from about 18 into their 40s and was taught by a 50+ one eyed fat man.

They tend to be supportive too.  Much like with anyone at a gym who isn't a complete douchelord they tend to appreciate that everyone starts somewhere.  Plus you don't have to wear super tight spandex that clings desperately to your every curve like a woman my age to the notion that she can still seduce current Hollywood heart throb if she could just meet him.  You can wear track pants or sweatpants or whatever.