Sexercise: Physical fitness and sexual fitness go hand in hand.

Think about the workout endured by the muscles of your core, pelvis, hips, and lower back when you have intercourse in any given position. When was the last time you worked these muscles in any remotely similar way, for any significant duration, outside of actual sexual intercourse? Never, maybe?

Now, what if you're a guy who hasn't been laid in a while? These muscles may get some exercise in your daily life outside of sex, but it's hardly going to be comparable to what goes on during sex. Your physical stamina during sex is going to suffer if you never get a workout that resembles sex.

Here's an exercise for you. Tweak it to your level of physical fitness. Lie face-down on the floor. Get into an elbow-plank position. That is, put your elbows on the floor under your shoulders, curl your toes under your feet, and lift your body off the floor so that only your elbows, forearms, and toes are touching. Now, bounce your pelvis up and down in a rhythm similar to if you were having energetic sex. Don't hit the floor--that would be uncomfortable, and you want your body's momentum to be absorbed by your muscles, not by the floor. The movement should be fairly short--perhaps a bit longer than the length of your penis--and fairly low to the floor, perhaps just brushing it with your penis (inside your shorts). Thrust like this 50 times.

By this time, your muscles are probably burning. Now lower your knees to the floor. Do another 50 pelvic bounces. It's easier on your knees than on your toes, but you've already worked the muscles in the first half of the exercise, so you'll probably end up pretty tired. If not, just go for more thrusts.

Of course, we can also incorporate this exercise into actual masturbation! You could press the back of your hand against your floor/bed and thrust into it. Even better, you could use a Fleshlight hands-free as detailed here.

By incorporating sexual movement into our exercise and our masturbation, we better prepare our body, mind, brain, and penis for sexual intercourse. By moving not just our hand, but our entire body in order to masturbate, we condition ourselves to climax from slower stimulation while conditioning our bodies to move faster, longer.