Doctors suggest a good workout several times a week to keep that body in tip-top shape. But hitting that gym late at night could have the opposite affect.

“If you work out later in the evening prior to sleep, your core body temperature will increase and stays high for some time, making it more difficult to sleep,” says pediatric sleep specialist, Dr. Jose Colon of The Children’s Hospital. Dr. Colon warns not getting enough rest can lead to elevated stress, even weight gain.

Fitness experts say don’t let the time of day be an excuse. “As long as you have time to workout, anytime is fine,” adds Cape Coral Wellness Center’s exercise specialist, Heather Brown. If you have no other option but to exercise at night, stay well-hydrated and take a relaxing bath or shower after your work out.

Strategies that could make your workout routine work in your favor, no matter what time of day.