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.
Reps is the number of times you lift the weight in a row, and sets is the number of times you do that. A safe bet for you would be to do 3 sets of 8-12 reps, with a minute and a half rest in between sets. As a girl, you don't have to worry about building prominent muscle. Most women have to work their butts off and/or take supplements to do that.