DALLAS

For years the common rule of thumb in the fitness world is that you don't weight weights or aerobics on the same day, they say it's bad for one or the other--but now new research finds that you can actually have your cake and eat it too.

Harrison Oldham doesn't eat much cake but he does exercise a lot and was one of those that lifted weights on one day and did cardio the next.

It's just the way it was done because most thought you benefitted more by doing one type of exercise a day.

Including Harrison Oldham.

"I played sports and that's how coaches always explained it to us, Harrison said. You know, you go and focus on one thing a day and that's just how you do it, you break up your week."

But Canadian and Swedish researchers say not so fast.

Both had men ride stationary bikes then do various leg exercises on the same day.

Before and after each session the men's legs were biopsied and researchers found that one exercise did not interfere with the benefits of the other.

Tyler Nicholson is personal trainer at Cross Fit 214 in Dallas, Texas.

Read more:
Lift Weights or do Aerobics? Age old question aswered