Lead Sled For Faster Sprints

Postactivation potentiation uses a brief, intense series of muscular contractions that can increase athletic performance. There are a number of ways to employ this technique, and a study published in the Journal of Strength and Conditioning Research offers some insight into how it might improve sprint speed.
 
On different training days, 22 rugby players performed 7.5 and 15 meter sprints pulling sleds weighed down with either 75% or 150% of their body weight. At 4, 8 and 12 minutes after sled pulls, they raced 15 meter sprints. Using 150% of their body weight didn’t boost sprint performance, but after using 75% their sprint times significantly improved between 8 and 12 minutes post-pull. Track and field athletes might want to experiment with this concept during practice.