Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to row on a rowing machine [title] Lock your feet into the straps. [step] Before you begin, make sure your feet are secured to the foot plate. To do so, use the straps provided on the machine.

Ending1: Make sure you are anchored firmly to the foot plate, then start rowing. Your feet will begin to move from the toes to hips. Ending2: Only tighten them every 10-20 times. [substeps] Alternatively, you can put an exercise ball under your inner elbow if you're worried about stiffness. Ending3: You should have a firm grip on the straps at all times. [substeps] Your feet should be firmly locked together, with your toes on the foot plate with your heels on the belt buckle. Ending4: [substeps] Pull the straps across the top of your foot. Secure them until they're tight to the point your feet do not slide around on the foot plate.

Answer format: ending1/ending2/ending3/ending4