adaptationsbackedbasedbehindbenefitsbestbodybonecardiocrusheffectiveeffortexerciseexercisesexplainedfatfirstfitnessfixgainsgymhabitshappierhealthhealthyinjuryisnleadlifelosslowermetabolicmusclemusclesmythspersonalproteinreallyrecoveryrepsresistancereverseroutinesayssciencesetsmarterstretchsuccesstrainingtruthtypewarmwayworkoutyear