Strength Endurance programs aim to increase your ability to work continuously with a targeted muscle group without fatiguing. It is an essential – and brutal – fitness attribute. Strength Endurance is absolutely necessary if your goal is to be unstoppable when facing long, gruelling challenges. You will perform a high volume of work, usually based off of your own ability, pushing you to the edge of muscle fatigue. These programs are highly encouraged for athletes looking to gain an edge or improve mental fitness.