Push or pull on any surface
A sled is a part of the training tools used by professional athletes for good reason. They develop functional strength for optimal performance. The sled push works your chest, triceps, shoulders, glutes, quads, hip flexors, hamstrings, core, and calves. The sled pull targets the lower back, shoulders, quads, hamstrings, calves, hip flexors, glutes, and core. Sled training can also be a great way to develop endurance, burn fat and it's even good for your knee health.
Freak Athlete's Multi Sled is one of the best sleds you can find today. It's modular and works on any surface including pavement. However it you decide to use it on pavement, the $29 plastic rails add-on is recommended to reduce wear and tear while minimizing noise. The sled can handle more than 500 lbs of load and yet by itself is light enough to travel with.
If you decide to get the Multi Sled you might to get the push post add-on to make full use of the sled for pushing.