Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to get better biceps [title] Do standing barbell curls. [step] This is probably the best exercise for biceps. The standing barbell curl is what most people think of when they think big biceps.

Ending1: Aim to do them at between 100-200 push-ups, giving your biceps about 40% strength as opposed to over 200 in a set number of sets. [substeps] Start with the standing barbell and raise your arm up until it just touches the ceiling. Ending2: Pay attention to your lower body while you're doing it and focus the curls to your biceps. [substeps] Standing up straight is easier for you for it. Ending3: [substeps] Start by doing chest presses at 12-15 reps. It is better to do stand barbell curls that are at least 1 arm width apart. Ending4: With the standard variation, you place your hands shoulder-width apart on the barbell, start with your elbows fully extended, and curl your arms upward to bring the barbell up to your chest. [substeps] Keep your elbows fixed and back straight for proper form.

Answer format: ending1/ending2/ending3/ending4