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Put your hamstrings under fire.
Work your core from every angle.
This eight-move routine will hit every muscle in your body. Hard.
Put some iron in each hand with this intensive upper-body routine.
This intense routine will absolutely pound your abdominals.
Think you've got what it takes?
In this CrossFit-inspired challenge, the kettlebell is king.
No space? You can do these four routines anywhere.