It takes a while to build a six pack bro. So unless you do H.I.T training for three months, your not gonna get those 300 spartan abs of cobble stone by summer. Since you say your on the thinner side trying to build up, your body doesn't have to burn as much fat as people trying to go down.
H.I.T = High Intensity Training
H.I.T = High Intensity Training
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