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Just Youtube 'barbrothersdc' its all about working out without hitting the gym. I stopped using gym equipment barbell, dumbell and stuff over an year ago, and started calisthenics, I must say it shows results in few weeks but you need a healthy diet plan before starting body-weight training, otherwise you won't see any progress. Stay healthy people.. P.S. try this for abs (for intermediate level);15 crunches or sit-ups15 in and outs30 second scissor kicks30 second front plank15 leg raises (on a bar)10-15 90 degree leg raises (on a bar)This is my basic workout routine for abdomen. Hope it helps. :)