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.
If you think you are going to fail, stop 1-2 reps before that failure feeling. You can still do several sets and get a pretty high volume of reps, but just no FAILURE reps. I like a Super Set Circuit for this type of workout. For instance do several sets 10-15 sets of 5-10 pullups / dips and 10-20 pushups per set..