Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to teach kids to run faster [title] Warm up with jumping exercises. [step] Jumping can help kids build the muscles they need to be strong runners. Before you begin to practice running, lead the kids through a set of jumping jacks or let them use a jump rope.

Ending1: Then, you can move into step five, which will require your kids to move their feet forward. Try to add jumping exercises a day and have your kids do them on a regular basis. Ending2: [title] Check their form while they run in place. [step] Ask kids to run in place as hard as they can for five seconds. Ending3: [substeps] Doing jumping exercises at home can be a good opportunity to help your kids build the muscles they'll need to be strong runners. However, these exercises are not recommended for beginners. Ending4: Just start with an easy jumping down step, then add some jumping to the routine. [title] Ask your kid what's active in the gym.

Answer format: ending1/ending2/ending3/ending4