Add one more benefit to exercise: it changes DNA in skeletal muscle cells and helps to reduce the chance of disease, according to a recent study from the University of Co
they re playing it by ear. martha. martha: elizabeth, thank you very much. beautiful spot there. gregg: new fitness studies are revealing strategies to maximize the time you spend in the gym. martha: always a good idea. if you re going to go, you might as well maximize it, right? the idea is changing the way we think about working out. joining us is kim car jim caris as we all get ready for summer. how you doing, jim? reporter: doing fine, martha. martha: what s this about don t eat? that s not a good strategy! that s interesting. it s definitely not but it s confusing. what the performance people say is you absolutely should eat prior to exercise, you ll be able to exercise longer, you ll be able to go harder, and that s great. but the big, big issue is what will you burn. fat or carbohydrates. some new research out of the u.k. says if you don t eat prior to exercise, you will burn a higher percentage of body fat when you actually are exercising. greg gregg so in other