| I gotta second the jump rope.  You can do it any where and it rocks. 
 When I try to cut I could, in the past, usually never get below 11-10% bf without really blowing my diet.  I don't want to skimp on food because I want to keep my muscle mass.  My cardio was just about running endurance 1 day, and then 2 days of HITT.  I switched to jump rope and watched the BF drop down to 8-9 in no time.  Abs much more defined as a result...
 
 Jump rope = awesome.
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