Ten years ago I started gentle yoga. It is for all ages, but most of us are older. Young athlete types want more, but it is plenty rigorous for me. It focuses on strength and balance. I do it free through Silver Sneakers on my Medicare Advantage Plan. They have it all over the US. One lady is in her 90s and does very well and is independent. Others have had knee and hip surgery and return to class. You can modify however it best works for you. I have osteoporosis so I am very concerned with strength and balance. I also walk my dog everyday.