I drag it in front of my house and I bring it with me to the gym I train clients at and do sled work in the parking lot. One of my favorite ways to use it with clients is to go outside after their strength training is done, and do multiple trips usually ranging from 3 to 6 trips down and back. It is a great form of cardiovascular work and instead of muscle wasting, (happens with long duration running) it builds and strengthens muscles, especially the entire leg. It does not get boring and best of all, you get lots of confused stares from onlookers who wonder why and what you are doing.
If an athlete lacks leg drive, the sled will make them get some leg drive. If you need to strengthen your hips, the sled will do it. If you want to firm up your thighs, the sled will do it. If you want to do some cardio that isn't boring, and helps you lose fat and speed up your metabolism faster than an elliptical or stationary bike, the sled can help you there too. The list goes on. Check out these example vids.