Weightless Strength Training

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Hiya!

I just started on really trying to build some muscle. I don't have access to weights however... So, I have had a buddy who's really into personal fitness suggest weightless workouts.

Currently I am doing sit-ups, push-ups, punching (I have a punching bag) and kicking (also the punching bag).

Is this effective? And are there any other exercises I could add?

Thanks!

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