Probably thee best guide and insight to the science, muscle building and retention and specific muscles involved and how to train them, training and workout guidelines and specifics, ur nutrition, and many other items on how to increase ur short distance speed 40yd dash type speed and all the wall thru acceleration, top end, maintenance, and ur explosiveness and form plus more. Check it out you won't be disappointed. I know this article has helped increase my speed dramatically, and I know for anyone who desires to, that it will do the same for you!! Check it out!! Link here below!!!

https://www.dropbox.com/s/q1ik5q4kjukpi0g/Coaches_Roundtable__Speed_development.2.pdf?dl=0