Interval training.: High intesity interval training can be a way to increase muscle mass without weights. Warm up, then run as fast as possible for 60 seconds then jog for 90 seconds. Repeat this 8 times. Do this 3 times weekly.
Answered 10/3/2016
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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