Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to exercise with a kettlebell [title] Start with a kettlebell that weighs 15-25 pounds (6.8-11. 3 kg). [step] The exact weight you should start with depends on how much weight-training experience you have and the size and weight of your body. The more experience you have lifting weights, the heavier kettlebell you can start with.

Ending1: [substeps] Kettlebells made for this type of weight-bearing exercise usually fit. There are a variety of kettlebells for different distances based on age. Ending2: [substeps] An experienced weightlifters' reps teacher can help guide you to get the best results while you start a kettlebell program. [title] Set a goal to be proficient when you first begin performing kettlebells. Ending3: [substeps] Find out how many calories you can lift. If you're a professional, your gym might give you a scale system that calls for 3 cups of water per pound of body weight. Ending4: [substeps] Even if you're an experienced weightlifter, you may want to start with a lighter kettlebell until you get used to exercising with it. [title] Exercise with a regular cast iron kettlebell when you're starting out.

Answer format: ending1/ending2/ending3/ending4