This results in shortness of breath and pulmonary edema. Common causes of left-sided failure include the following: 1  Drinking too much alcohol. 2  Heart attack. 3  Heart muscle infections. 4  High blood pressure. 5  Hypothyroidism. 6  Leaking or narrow heart valves.
Â· just now. Report Abuse. Since you are trying to tone, do 2 or 3 sets of 12-15 reps. In other words, do 12-15 squats or leg presses, then rest 30 seconds to one minute, and repeat one or two more times. If you were trying to gain muscle mass, you would do less reps and more sets with a higher weight.
Rep (repetition) is one complete motion of an exercise. A set is a group of consecutive repetitions. For example, you can say, âI did two sets of ten reps on the chest press.â This means that you did ten consecutive chest presses, rested, and then did another ten chest presses.