Because of pain in the joints people with Athritis are reluctant to engage in any exercise and walking, the simple form of exercise is often painful. I discovered Dr Lam's DVD by accident looking at various forms of martial arts on the internet. It is simple to follow, well thought out for Arthritics, does not put much pressure on the joints and after only one week exercising my hip and leg joints I was steadier with my balance and the joints felt easier. I love it. Karate for 70 year olds I realise is in your dreams but it would have been fun.