This is a progression on BODYWEIGHT ABS 4.0, 3.0, 2.0 and 1.0 so be sure to master that routine first before embarking on this new challenge! Burn belly fat fast at home with this equipment-free full-body core training circuit. You can make it your workout of the day anytime or use it on off-days for active recovery since it won't cause too much muscle damage and your core muscles tend to recover faster.