I'm a fast twitch muscle type of person. At my age, endurance sports are all that's left. All endurance sports are tough for me. I'm currently training for a marathon and ride a century a month. Running is a lot harder for me unless it is a climbing ride. But it is really about what you are training for. If I tried to play 2 hours of basketball tomorrow, I would be winded after 2 trips up the court. And, I would have trouble getting out of bed and walking the next day.

With the marathon training now I am running over 20 miles a week. But attempting a competitive game of some type of fast twitch sport, even some hard sprinting workouts would most likely result in some immediate cramps or pulled muscles. The muscles are no longer trained for that.