Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to improve punching speed [title] Strengthen your lower body by jumping, cycling, or squatting. [step] Grab a jump rope to use, or do jumping jacks. Try cycling with either a stationary bike or a bicycle.

Ending1: Start by jumping onto the edge of your bike or a bicycle that is stationary. If your bike is stationary, your fingers should touch the sides of the handlebars, so make sure that you are properly side-by-side and lean forward slightly. Ending2: [substeps] If you have a gym membership, consider purchasing an exercise rope to use to hang yourself. This will allow you to join a team and exercise for 30 minutes at a time. Ending3: Add weights to your squats for an extra challenge. Your lower body is essentially a foundation for power, so develop and strengthen your quads and hamstrings. Ending4: Consider sudoku or another form of competitive lower body fighting. If you don't 've a bike, try using a rope or swing your body up and down as you make impact with the ground.

Answer format: ending1/ending2/ending3/ending4