Quote Originally Posted by p4pking View Post
The better shape you are in the more you can exert yourself while maintaining a low pulse etc. It's all relative, just be meticulous about gradually increasing your pace while staying within a comfort zone. And sprinting, Master? I call bullshit
I do sprints on the indoor cycle 15 seconds on every minute for 35 minutes. It is hard and works on the cardio. My left knee is injured so trying to maintain some level of fitness until it is OK to run on.