By adding a protein supplement to your diet, you can lose fat mass while retaining your muscle mass. (gymjunkies.com)
Most cats lose weight far more efficiently on a canned food than dry food diet: they lose body fat while retaining muscle mass. (littlebigcat.com)
This is the perfect back workout when you're getting ready for a photo shoot or contest, helping you lean out while retaining muscle tissue. (bodybuilding.com)