Burning calories does not always mean spending 30 minutes on the treadmill. In fact there are a lot of ways we can burn calories while doing something good for others or the environment.
Think about joining National River Cleanup — the most popular and successful stream and river cleanup program in the country. It has removed 1,000 tons of litter and debris from America's rivers and streams. Along with helping to remove the junk, you'll also be burning a lot of calories. An 150-pound person can burn around 340 calories in just one hour of picking up litter.
Find a River Cleanup near you here.