Carbs and fats are the primary energy sources that your body pulls from during rigorous training sessions. However, proper hydration and the amount of sleep you got the night before factor in as well. Luckily, if you haven’t been keeping up with your diet or self care, there are some supplements that can help you go the extra mile. Stimulant products will help motivate you to get off the couch and in the gym, keep you focused while you’re there, and reduce the effects of fatigue. Non-stimulant products, like creatine, act as an energy source for your body, powering you through even the worst slumps.