The thought of trying to sweat in the heat and humidity can keep some people on the couch. Here are ways to make hot-weather workouts more appealing:

Pick a good time ... Exercise in the early morning or evening, when temperatures are cooler. A recent study by London researchers showed people do best in the morning in hot conditions, because their core body temperature starts out lower.

... and place. Look for shaded, grassy areas rather than hot pavement, especially if you work out midday. Of course, air-conditioned gyms and living rooms are also good choices.

Drink early. Have plenty of water before you work out to help spare yourself the misery of thirst.

Wear the right clothes. You'll be much happier in loose, light-colored duds made of cotton or mesh-like fabrics that keep skin dryer. Dark clothes absorb more heat.

Plan it out. Try the "if ... then" method to schedule exercise for the next day: As in, "I will jog at 8 a.m., but if it's already 100 degrees, then I will go to the 8:30 aerobics class instead."

Reconsider likes and dislikes. Maybe you didn't like swimming or aerobics 20 years ago, but why not try again when it's too hot to run outside?

Start gradually. You may need to work out at a lower intensity for a few days to help your body adjust — and make life less painful.

Ask about gym discounts. Check for cool deals or add-ons with your membership, such as a free trial session with a personal trainer or on-site childcare.

Be knowledgeable. Instead of fearing heat-related illnesses, learn about them: If you develop a headache, clammy skin, dizziness or nausea, for example, stop and cool down.