If your testosterone levels is below 300/prcm than you may start exercise
1 By weight lifting
If you do weight lifting than will strong your pelvic muscles and increase your testosterone level
2 By kegel exercise
Kegel exercise to way
(A) By Anus push and hold 10 round 3 time in a day and 4 days in a week
(B) By Urethra push and hold than you do urination
Penis muscle and pelvic muscles and testosterone Will be increase by this.