PER4M Pre-Workout – Nexus (Energy & Focus Pre-Workout Supplement)PER4M Pre Workout Nexus Energy & Focus Formula PER4M Pre Workout by Nexus is a performance pre workout supplement designed to increase energy, focus, endurance, and workout performance. This pre workout powder helps improve training intensity, mental focus, and endurance so you can train harder, lift heavier, and perform at your best during every workout. Pre workout supplements are designed to support energy, focus, endurance, strength, and training