These should be fast and max effort. Scale the weight so that the sled is moving fast for all 15s, can maintain intensity through the 5 bouts, and are smooth throughout.
Tips – Stay low on the sleds, and pick the knees up – the goal here is speed, and maintaining the speed. The first set may not fatigue you, as it’s a short interval (in the CP realm), but as the sets progress, you’ll start to feel the fatigue. Make sure to focus on quality of movement.