The pancreas produces insulin to manage blood sugar. High blood sugar from insulin resistance can induce type 2 diabetes.
Several thyroid hormones influence metabolism. A hyperactive or hypoactive thyroid can harm your metabolism and health.
The brain produces "feel-good" hormones called endorphins, which regulate mood and mental health. Exercise can naturally boost its production, improving our lives.
Oxytocin, the "love hormone," is released largely when people cuddle. Exercise also increases oxytocin production.
Dopamine is our natural reward mechanism, hence it's important in addiction. Exercise does release adrenal gland dopamine.
Serotonin is involved in a number of important functions, including sleep and mood control, to mention a few.
Our circadian clock depends on melatonin. Exercise can make our sleep-wake cycle release more or less melatonin in response to light and darkness.