Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to build strength gradually [title] Choose the appropriate weight. [step] When you're just starting out with exercise or you want to build your strength slowly, it's important to choose the appropriate weight. Too much or too little won't help you in the long-term.

Ending1: Any extra weight that's too much for you or you may feel tired while exercising can lose your muscle mass. Don't set your weight too high. Ending2: [substeps] The ideal weight is one that allows you to do one set of eight to 12 repetitions. Your muscle or muscle group should feel very fatigued at the end of the session. Ending3: Feel free to become more active as it can be a great exercise to help tone your muscles. [title] Speak with your doctor about your weight loss regimen. Ending4: [substeps] Start with a weight you are comfortable carrying with you at all times. Choose an exercise that strengthens your muscles regularly while you're doing work outs.

Answer format: ending1/ending2/ending3/ending4