A: That depends on how you tolerate it. The more stressed that your adrenals are, the less cardio you can tolerate. Being on the pregnenolone and DHEA are going to help you tolerate more cardio. One of the ways to figure this out and treat it, is to make sure that you eliminate the things in your life that are causing you adrenal fatigue. These would be lack of sleep, inflammation in your body, and stressful things, which can be excess exercise. Looking at your lifestyle and eliminating things that are contributing to stress are going to be the key to reversing adrenal fatigue, as well as taking supplements.