Functional training exercises should replicate the movements and patterns used on the court, such as lateral steps, lunges, twists, swings, jumps, and sprints. These exercises should also challenge your core stability, balance, coordination, and power. For example, lateral skater jumps can improve your lateral explosiveness, agility, and balance. To do this exercise, start in a squat position and jump sideways to land on one foot. Then jump back to the other side and repeat. You can use a cone or a marker to measure the distance of your jumps. Medicine ball rotational tosses are another exercise that enhances your rotational power, core strength, and coordination. Stand sideways to a wall and hold a medicine ball in front of your chest. Rotate your torso and throw the ball against the wall as hard as you can. Catch the ball and repeat on the other side. You can vary the angle and height of your tosses to mimic different tennis strokes. Lastly, single-leg Romanian deadlifts strengthen your posterior chain and improve your balance and stability. Stand on one leg and hold a dumbbell in the opposite hand. Hinge at your hips and lower the dumbbell to the floor while keeping your back straight and your knee slightly bent. Return to the starting position and repeat on the other leg.