Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to start mountain biking [title] Get an appropriately-sized mountain bike. [step] Your bike should match your height, body type, and the length of your leg. If a bike doesn't fit you well, then it will be uncomfortable and inefficient to ride.

Ending1: [substeps] Bike shops sell perfectly sized mountain bikes, so choose bike that is comfortable but still aesthetically pleasing. Additionally, look around for a bike with good brakes and nice height. Ending2: As you bike, you could also stand on the bicycle and work on your legs. This will help prevent injury on your thighs, hips, and tailbone. Ending3: A good bike shop will be able to set you up with a bike specific to your needs. Many will offer repair, service plans or discounts on future purchases. Ending4: It is recommended that you have an appropriate weight of at least 70 pounds. If your bike cannot handle around 100 pounds, consider purchasing a bike that can support that number.

Answer format: ending1/ending2/ending3/ending4