What makes humans sprint faster?

Is it the muscles that makes us sprint faster? tell me how does it work...would the guy with less muscles in their legs run slower than the guy will more muscles in their legs.
 
Half of the speed part of running has to do with the muscle's composition. Everyone has an array of fast and slow twitch fibers throughout their muscle. Those with slower twitch are the more endurance-based runners and fast twitchers are the sprinters. I know you can traing your muscles to adapt to sprinting and train to adapt to endurance events but on the whole genetically your muscles are more prone one way or another. As far as mass of muscle that doesn't even say much. Sometimes muscle mass hinders rather than helps where running is concerned. If you had two non-runner guys with similar athletic ability side by side one with muscle, the other without I would think the one who is genetically built with fast twitch muscle fibers would win the race.
 
I agree, however the guy that squats 100 pounds more then the other guy is going to win because he is combining is leg strength with speed. (power) and thats what are coaches told us running was all about-power.

However that doesn't mean if you lift weights in the legs your gonna get faster. Do ployometrics if you want to build your fast twitch fibers. And sprint of course.
 
Apparently it has a lot to do with flexibility. I have been stretching for a while now, and I have noticed an increase in pace when sprinting. I haven't been timed for ages though so I couldn't back that up.
 
i agree with all of the above well-stated remarks. i would only add that proper running form is essential to both speed and endurance. just as one example, swinging your arms across your body will hinder your momentum and tire your upper body, leading to poor performance. another particularly bad trap is to strike the ground with your heels rather than the midfoot to balls of your feet.
 
I agree when I was doing my 40 yard time today, my it looked like I was tip-toe running, my heels barely ever hit the ground, except near the end.

I also found that when your about to sprint get in a low stance and lean forward a little bit, this will boost your acceleration to its fullest earlier.
 
I agree that flexibility seems to play a role as well. When I am more flexible I have longer strides and feel very loose and controlled in my skin. If I'm tight I feel like my running is suffocated and its a chore.
 
interesting thoughts...

now that I think about it myself, and remember my experience training with my dad and one of the shaolin warrior monks, who use to run the stairmaster mountain climb morning and night on the clock for training at the warrior temlple, and him telling us to run on our toes, remembering how important flexibilty is for martial artists,..
It makes sense that if you have strong calves and are flexible that when you sprint that that flexibilty powered by your calf strength would allow you to
get more power in your stride by the increased length allowing you a better lever and and more to pull it back with as your feet hit the ground sending your body forward.
..maybe thAts why hillsprints are so good

and why i always get a better cardio sesh after a pilates warm up. Sounds good logic in my book anyway.

cheers.
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Yes, supporting Blooming Lutus's statement I find that if I have practised sprinting on inclines then I can sprint faster flat. I sometime practise with weights on me. I find this helps me get faster. But sometimes when I run it 'doesn't feel right.' No matter how hard I pump my arms my legs just hurt and can't move. Thankfully this hasn't happened for about a year, but I remember having major off days.
 
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