An essential practice for injury prevention in fitness training is proper warm-up and cool-down. Warming up prepares the body for exercise by increasing blood flow to muscles and enhancing flexibility. It reduces the risk of strains and sprains. Cooling down helps in the gradual recovery of heart rate and muscles, preventing stiffness and reducing the chance of delayed onset muscle soreness (DOMS). Additionally, incorporating strength training, proper form, and listening to your body can further minimize the risk of injuries during workouts.