Read time: 3 minutes. Resisted vs. Unresisted Sprint Training: What Works Best? Sprinting is crucial in rugby, impacting speed, acceleration, and momentum in contact situations. Resisted Sprint Training (RST) and Unresisted Sprint Training (UST) are both used in speed development. But which is more effective? This study compared UST vs. RST (50% body mass) in youth rugby players over a 4-week period. Is unresisted or heavy sled resisted sprint training best for improving sprint performance...