To improve your performance, you need to be addressing your physiological limitations -- the mechanical, physical, and biochemical boundaries and restrictions of your body.
A "Limiter" describes the physiological system that first reaches its functional limit as exercise load or duration is increased. The "Compensator" is another system that picks up the slack from the Limiter . For instance, if you are respiratory limited, meaning you lack sufficient oxygen for the muscle to generate adequate aerobic output, you will have to utilise your anaerobic respiration resources to compensate.
To better understand your Limiters and start training to improve that system, consider taking these Tests:
Add either Test to your Personalised Warm-up Program for a reduced fee.