There is good sense in Ramachandran Pattabiraman's post.
State of health can be maintained by our life style itself. There is no necessary to find separate time and venue for activities that will lead to health.
Old timers used to say that if our intake(food) output (excretions),are regulated and normal and if our physical activity and rest are also proper and normal, then we need not do anything extra for mainating a healthy state of life and longevity. Prayer also should fit in somewhere in this to have health and peace for mind also.
The invasion of our space by mechanical aids made our physical activity almost NIL. That is the first cause for ill health. We got much time and we used that extra time for so-called entertainments , tasty food, and 'rest'. Our food-activity-rest- excretion cycle became erratic and all our systems started malfunctioning.
If we can review and analyse our pattern of activities, food and life style we can find that in each and everything ,including prayers and pooja, there was some kind of activity for each part of the body and also to mind.
So exercise was inbuilt in our life style itself. There was no necessity t find separate time for that.
If not fully going back to old times, at least we can bring back some of them to be part of our daily life and stay healthy.