Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to perform a weighted squat [title] Begin your warmup by running on a treadmill. [step] Running on a treadmill before squatting is a great way to get the blood flowing into your legs. This allows you to perform your workout better.

Ending1: [substeps] Start at a low speed setting and fast walk, until you feel your heart rate has started to increase. Increase the speed, until you reach a comfortable jog. Ending2: However, be sure to avoid the spin, giving your legs a much bigger impact if you do the workout outside of a treadmill. [substeps] Before you get on a treadmill, make sure you're hydrated. Ending3: [substeps] Start on your right foot and lift one foot up and rest on the floor. Lift one foot off the floor, and roll it underneath the other. Ending4: Start by getting off the treadmill and hiking up a hill so that your feet don't get sore. [substeps] Warm up your muscles by standing with a few inches of space between your feet and moving into the wall.

Answer format: ending1/ending2/ending3/ending4