Here is a heavy duty sled designed for serious functional training. The Torque Fitness Tank M4 Push Sled has dual variable resistance brakes. It has 3 resistance levels that you can set at each end, so you can have separate resistance levels for push and pull exercises.
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The Tank M4 is a bi-directional sled. With an optional weigh horn, you can add more intensity to your towing exercises. The Tank M4 has heavy duty rubber tires and works on grass, rubber, concrete, asphalt, and wood.
The TANK M4 from Torque Fitness
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