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.
Here now are the most commonly used rep ranges along with their primary training effect: 1  1-5 Reps Per Set = Mostly Strength. 2  5-8 Reps Per Set = Strength AND Muscle Equally. 3  8-10 Reps Per Set = Muscle With Some Strength. 4  10-12 Reps Per Set = Muscle With Some Endurance. 5  12-15 Reps Per Set = Endurance With Some Muscle.