IT REALLY IS POSSIBLE TO EXERCISE TOO MUCH
Robert Irwin boosted his running to 80 miles a week when he was in his 20s. It felt good, until it started feeling bad.
Ref. https://www.cnn.com/2006/HEALTH/diet.fitnes...g.ap/index.html
Of course you can eercise too much. It's called "over training" and can damage your joints, muscles or bones. Eercise is one thing, but the key to growth and development is the rest period. After a heavy workout it can take up to four days to recover. If you're an older guy then it can be a week or more.
New approach to hitting the gym: Optimizing weight and endurance training. Sports scientists are warning that fatigue from weight training can carry over to endurance training and the two activities must be better coordinated to maximize athletes' performance. Source 5h.