If you are flooded with stress hormones, and then exercise to get endorphens, do the stress hormones go away or are they just masked?

meditate?

or break something.

Endorphins from exercise are a somewhat welcome side effect, but are not the only benefit. Cardiac exercise increases the oxygen level in your entire body, which also helps to create a sense of well-being, and the elimination of muscular flaccidity aids your sense of balance, poise, and posture, in turn providing a subconscious boost to your self-esteem.
Keep up with cardio exercising, but if your desired result is an endorphin flood, you had better prepare for disappointment.