In my opinion sprints are the most under utilized exercise. In terms of fitness and physique, sprinting has the highest ROI of any form of exercise (or tied with squats at least). If you invest around 30 minutes a week in sprinting you will notice a tangible bump in your baseline energy level and musculature. It'll improve your endurance more effectively than jogging will, in 25% of the time. You'll notice the difference after just a couple weeks.
Humans are born to run. Every one of us is capable of running fast if you do it consistently. I like knowing that if for any reason I have to get out of dodge quick I'm faster than 98% of the population, because nobody trains for speed. When was the last time you opened it up and ran full tilt, even if only for a few strides? If you can't run a couple wind sprints without your legs turning to jello then you aren't fit, period. Don't care about your weight room numbers, or how many miles you log on the treadmill each week.
I love lifting, and am in the gym 3 times a week every week. I'll tell you, the endorphin rush high I get from sprinting is better than the weight room equivalent. Especially shirtless in the park, sun out and barefoot on some fresh green grass.
Here's my advice for those who don't yet sprint but want to reap the huge benefits: keep it simple. Short and sweet, especially if your BF% is higher than you want it to be. Forget any sort of plan that looks like this: 5x60meters, 5x100, meters 3x200 meters or whatever. That's miserable, which is a recipe for skipped workouts in the near future.
This should be your goal: Run as fast as you can, at least once, every single week no matter what. No other movement requires peak output from so many different muscles at the same time, so your body won't be used to it. You need to acclimate your body to this state of maximal exertion, so consistency week after week is the important thing. So, make it as painless as possible.
Here's what I do when I'm starting from square one:
- start jogging
- after a minute or so as you loosen up a bit pick up your speed and think about your stride opening up
- about a minute longer and I'm breathing a little heavier, feeling some muscle fatigue
- slow to a walk for about a minute
- stop and do leg swings, front to back and side to side, quick hamstring and quad stretch
- start jogging again, put on a song that gets me jacked up
- increase speed so that I hit top speed in about 50 meters (this is relatively slow acceleration, per the 'painless as possible' philosophy)
- hold top speed as long as I can until legs get wobbly and balance starts to go (doesn't take long if you haven't sprinted in a while)
- slow to a walk for as long as it takes you to catch your breath (at least a minute)
- repeat as many times as you want (I usually only do about 6 'reps', 3 if I'm just starting out)
This can be done in less than 20 minutes. I do it twice a week these days, but do it once and you will feel different. 20 minutes a week to change your body in a serious way and move closer towards optimizing your athleticism.