Maintaining good control of the abdominal and back muscles is especially important when using an upright exercise bike (as opposed to a recumbent model).
source
Lose 10 lbs in One Month the Natural Way
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Maintaining good control of the abdominal and back muscles is especially important when using an upright exercise bike (as opposed to a recumbent model).
source
Lose 10 lbs in One Month the Natural Way
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