Elasticity Training

i will look for those. i did a lot of training on grass myself, but wouldnt it seem that if im training on grass then id be running too slow to really improve top speed? it seems to me to hit 95% of top speed it have to be on track surface

and as for the sleds weighing 50 lbs, i guess it also depends on the surface the sled is on too, right?

i just read some articles that talk about training natural strengths rather than weaknesses and my strength when i began track was my peak speed, but the only training i think i really have a grasp on is that which improves se or starting. i just want an idea of what i should be doing to train what was originally the best part of my race