Do 2 to 3 full body weightlifting workouts weekly with exercises like squats, deadlifts, bench presses, olympic lifts at 85 to 95% of your 1 repetition maximum. Rest 120 seconds in between reps. Do forced reps with a partner where possible - where you perform as many reps as you can before your buddy assists your for completing 1 to 5 additional reps. Be sure to include leg exercises for maximum Testosterone boost.
If you are not physically active, then first condition yourself through Sprint, Tabata, and Aerobic workouts before doing Resistance Training. And if you have not lifted weights before, then get a trainer to learn proper form to prevent injury. Don't do workouts for longer than one hour since this can cause a drop in Testosterone levels.