Final answer:
The supplement Bo took likely contained high levels of testosterone, which can increase muscle mass and aggression, leading to Bo's experiences with both improved strength and increased tendency to engage in fights.
Step-by-step explanation:
It is possible that the supplement contained high levels of testosterone. Testosterone is a hormone that can contribute to muscle growth, which may explain the increased strength. However, testosterone has also been associated with aggressive behavior, which could be why Bo has found himself getting into fights. As testosterone can have multiple effects on the body and behavior, it's important for athletes to consult with healthcare professionals before taking any supplement that may alter hormone levels.