Isometric Light

What I found out almost a decade ago through overcoming isometrics, is that although I was training my strength it greatly improved my conditioning. Because of the rapid strength increases with this form of training, I felt lighter. Feeling lighter will help you to jump higher, run faster, run farther etc.
Any form of training that increases the contractile capability of your muscles in an energy-efficient manner will accomplish this.

Nerve & Muscle Fitness Full E-Book ($20): https://www.nervemuscle.com/nerve-muscle-store/p/nerve-muscle-fitness

Just Overcoming Isometrics E-book ($10): https://www.nervemuscle.com/nerve-muscle-store/p/overcoming-isometrics-manual

One-on-One Training: https://www.nervemuscle.com/fitness-coaching-options