A member asked:

Can spend 45 min on treadmill at 3.7 mph inclining every 4 min ending at level 9. i spend 45 min on exercise bike.flight of stairs? grueling. why?

A doctor has provided 1 answer

Not warmed up: My best estimate per computer would be that you are not "warmed up" when you hit one flight of stairs spontaneously. When you are doing workouts, you are inclining gradually and body has time to warm up/adjust.

Answered 8/1/2014

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