Energy boosters work in a wide variety of ways—some stimulate your central nervous system (CNS), while others increase brain activity. Each of these forms of energy allows you to train harder for longer.
Creatine – Creatine drives fluid into your muscle cells, blunting soreness and allowing you to lift heavier for longer. Look for creatine monohydrate, the gold standard of creatines.
Beta-Alanine – This amino acid boosts muscular strength and endurance by increasing your body’s levels of carnosine, a small peptide formed of beta-alanine and histidine.
Caffeine Anhydrous – Research demonstrates that this dry form of the stimulant is the best for increasing energy and strength. Taking caffeine helps reduce the perceived pain of lifting weights.
BCAAs – This group of amino acids includes leucine, isoleucine and valine. BCAAs are absorbed more readily into your system, bypassing your liver to go directly to working muscles, delivering fast energy. n Yohimbe As with caffeine, this extract from bark helps drive up energy levels by reducing stored body fat you can use as energy.