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You can always hit the battle ropes, mixing that up with some core exercises can get the heart rate up. I like to go 30 seconds on the ropes, do a min plank, throw in some legs lifts or Russian twists, rest for a min and do it again 3 or 4 times.
Cutting out or at least limiting sugar/fructose, eating healthy saturated fats and upping your zinc and vitamin-D intake. Also high-intensity exercises and strength training, with shorter rest periods, can also help at boost testosterone levels. Oh yeah don't forget to get more rest.