It doesn't feel like summer but it OFFICIALLY starts June 21st.  So here's some advice on how to slim down while you enjoy the warmer weather.

DietsInReview.com posted a list of popular summer activities, and how many calories they burn.  Here are the top four.

#1.)  Water Skiing. In 30 minutes, a 150-pound person burns around 200 calories.  And it works your upper and lower body.

#2.)  Swimming. Depending on your body weight, just swimming around casually burns between 250 and 400 calories an hour.  And if you swim laps, you can burn a lot more.

#3.)  Hiking. If you're 150 pounds, you'll burn about 400 calories on a one-hour hike, depending on how steep it is.  If you weigh MORE than that, obviously you'll burn more calories, because each step requires more energy.

#4.)  Playing Nine Holes of Golf. If you walk AND carry your clubs, you'll burn around 700 calories, or 1,400 if you do 18 holes.  Just be careful about how many calories you CONSUME on the golf course.

If you golf 18 holes, but have four or five beers on the course and a cheeseburger for lunch, they cancel each other out.