The new energy fad in gyms across America can be summed up in one powerful word, espresso. People are taking a shot or two of espresso before their workout for an extra kick. The power of espresso is in its natural caffeine. A 1 oz shot of espresso contains an unbelievable 64 mg of natural caffeine. For comparison a 1 oz shot of regular coffee only has 12 mg of natural caffeine. Starbucks sells a 1 oz shot of espresso for around $2 and a lot of gyms actually have some sort of cafe in the gym for more convenience. Many people are sensitive to caffeine and can get the giters if they have too much. If you feel tired before your workout and need a pick me up, then espresso might just be your answer.