Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to jump 6 to 12 inches higher and run faster [title] Start the exercises by first warming up your muscles. [step] Stretch legs and arms, and jog around for a few minutes. [title] Stand up and sit down.

Ending1: [step] Slowly bend at the knees keeping your back straight. Crouch down as low as possible arms on your waist and slowly rise back up. Ending2: [title] Switch legs, keep your knees square in your center and lean forward. [title] Your muscles are ready, and feel amazing! [title] Lean over 90 degrees back, with your elbows bent. Ending3: [step] Just stay balanced for the first couple of times. [title] Lift a leg and turn it side to side. Ending4: [step] Once your muscles are warmed up, stand up quickly and walk yourself up to the top of the stairs. [title] Lower the weights from your arms to the point between your shoulders.

Answer format: ending1/ending2/ending3/ending4