To improve your vertical jump for sports like basketball or volleyball, focus on exercises that target explosive lower-body power and strength. Incorporate plyometric exercises like jump squats, box jumps, and depth jumps to improve fast-twitch muscle fiber recruitment and enhance vertical leap. Additionally, include strength training exercises such as squats, lunges, and deadlifts to build overall lower-body strength and stability. Practice jumping technique and landing mechanics to maximize power and efficiency, and gradually increase intensity and volume of training to continue making progress in vertical jump performance.