Fred Duncan on Instagram: "Speed is about how you apply force. Research continues to show that net horizontal force, especially in the first few steps, is one of the strongest predictors of acceleration performance (Morin et al., 2011, Cross et al., 2018). You can lift heavy and still be slow if you’re not projecting force in the right direction. The best sprinters direct force back and down to propel the center of mass forward. That’s why resisted sprint training, projection drills, and hip dom