Getting enough sleep is a good exercise that boosts testosterone levels. Not only does the sleep recover you from the training, but also it facilitates hormones responsible for building muscles such as growth hormones and testosterone high. Enough sleep gives you enough energy and higher hormone levels vital for muscle building. Having sex regularly once in a week in a week is a good exercise that boosts testosterone. Regular ejaculation boosts testosterone levels in your body, which in turn works on the endocrine system, aiding to maintaining it primed.
Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males. 
Hello! I’m a 33-year-old man. I’m 170 centimeters tall and 75 kilos. Bodybuilding has been my passion for four years but I never used anabolic steroids. During the past two years, I noticed a lower libido and went to test my hormones. Here are my results: luteinizing hormone – mg/ml, estradiol – 101 pmol/l, testosterone – nmol/l, prolactin – 154 mg /l. I was prescribed 50mg Clomid for two months and as a result, my luteinizing hormone was up to 13 mU/l, and testosterone to 36 nmol/l. After completing a course of treatment with Clomid, my testosterone has stayed at 25 nmol/l with luteinizing hormone at MU/ml. I finally enjoy a high libido again and I‘m in great shape.