@efxsports: Luke, a fitness addict and GNC employee, shares a little bit about why Karbolyn fits his specific fitness goals, and why he recommends it to customers coming into his store. Karbolyn has a wide range of benefits for any athlete or fitness enthusiast, and can greatly help you better train, perform and achieve your specific fitness goals. - - #fitfam #gymaddict #bulkingdiet #fitnessfuel #karbolyn #preworkout #carbloading