Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to prevent knee injuries in rowing [title] Enroll in a rowing program with an experienced rowing coach. [substeps] Many cities and towns with a marina, lake, or river have a rowing club where you can take classes or private lessons. If you don't live by the water or don't feel comfortable on the water, you can use a rowing machine at your local gym or buy one for use at home.

Ending1: [title] Don't practice bending down or touching your knee. [step] Rowing is a much more comfortable exercise for your knee, not least because it helps you with rhythm and coordination. Ending2: Make sure to take some lessons from a personal trainer so you understand the basics of the exercise. [title] Warm up thoroughly before every training session, as this is key in preventing knee injuries in rowing. Ending3: [title] Rest your leg on a rowing belt. [step] Use a rowing belt to support your knee on board. Ending4: [title] Have a strong right foot forward with your left hand at the pump of your rowing machine. [step] You need to work your right leg back with your right foot beside your right hand.

Answer format: ending1/ending2/ending3/ending4