Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to sprint 100 meters [title] Train for the race. [step] In order to get in shape to compete in the 100 m, you've got to do some general training beforehand. You need to improve your overall cardiovascular system and do a little endurance training.

Ending1: Generally, you need to improve your overall athleticism. Consider : [substeps] Implementing a weight training regimen to get yourself in shape. Ending2: Your heart rate should be between 40 and 80 beats per minute, after which you should begin working hard and doing regular exercises. [substeps] Before the race, wear an all-casual outfit. Ending3: Do some cardio and strength training before the race so you can stay on track. Begin to feel full 3-4 hours before the race. Ending4: [substeps] This mainly consists of sprinting 200 meters, plus stretching and sweating to keep yourself prepared to rest and cool down in the run. Soon afterwards, to rebuild muscle you'll need to be able to sprint 100 meters.

Answer format: ending1/ending2/ending3/ending4