I’m confused about this issue. Many experts say you are suppose to relax while sprinting but im kind of confused about this. while running should i try to run as fast as i can or 85%.
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You’re confusing subjective effort with objective performance. This is a tricky issue because at high intensity levels the two actually reverse. In other words, you’re usually running your best times when you think you’re only going 90%.
if you are meant to run at 100% effort inorder to run fast you must relax.for most untrained people the faster you want to go the more you try to push it.with tension you will not reach full movements.sprinting is about co-ordination and timing and if you try and get tense this co-ordination will fall apart thus leading to slower times!
when you run at 85% you will have no tension and you must learn this feeling and carry it onto 100% sprinting.
Do you guys relax the whole race? Even the start? I can relax from 30-100 but have it’s hard to relax at the start…less difficult if I’m super prepared (not that that’s ever happened 
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0-30 you are getting it hard, 30-60 your are transitioning 60-100 relax and let whatever you have left come out. Pressing will tighten you up and slow you down.
so i should i run at 100% but relax every muscle that doesn’t contribute to sprinting…So sprinting is mainly about co-ordination
trust me you will use nearly every muscle while sprinting! i remember carl lewis saying that he sometimes runs so hard/fast that hes on the edge of loosing control.this is whats its all about…running as fast as you can while maintaining control thus staying relax and in control.
a tense muscle will not react as fast as a relaxed muscle and the range of motion will not be the same as one will be more limited than the other.
Take a look at some recent pix of Asafa and Shirvington side by side in the Melbourne meet this week. They are posted on the last page or so of the “analyse this” thread. You will see what is meant by “relaxation” as demonstrated by Asafa, as opposed to the alternative demonstrated by Shirvington.
Relaxation is usually directed toward the hands, arms, shoulders, neck and face. There is a lot of tension bound up in Shrivington, none in Asafa in those areas.
Sometimes trying “more” will give you “less” of a performance. People will get tense when they keep pressing for something that isn’t yet in them - speed for the most part. Take your velocity up through the gears and when you’ve reached 100%, mate that’s all there is. Making a face and fighting through brick walls like some sort of Robocop isn’t going to you to the finish line one moment sooner. But it will probably get you there late.
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