The lead climber typically connects the rope to the protection with carabiners or quickdraws. If the lead climber falls, he will fall twice the length of the rope out from the last protection point, plus rope stretch (typically 5% to 8% of the rope out), plus slack. If any of the gear breaks or pulls out of the rock or if the belayer fails to lock off the belay device immediately, the fall will be significantly longer. Thus if a climber is 2 metres above the last protection he will fall 2 metres to the protection, 2 metres below the protection, plus slack and rope stretch, for a total fall of over 4 metres.

If the leader falls, the belayer arrests the rope. This is achieved by running the rope through a belay device attached to the belayer's harness. The belay device runs the rope through a series of sharp curves that, when operated properly, greatly increase the friction and stop the rope from running. Some of the more popular types of belay devices are the ATC Belay Device, the Figure 8 and various autolocking belay devices such as the Petzl Gri-Gri.

At the top of the pitch, the leader sets up a secure anchor system, also called a belay, from where he can belay as his partner climbs. The second climber removes the gear from the rock (traditional climbing) or removes the quickdraw from the bolted hanger (sport climbing). Both climbers are now at the top of the pitch with all their equipment. Note that the second is protected from above while climbing, but the leader is not, so being the leader is more challenging and dangerous. After completing their climb, with both climbers at the top of the pitch, they must eventually rappel or otherwise descend the climb in order to return to their starting point.

Occasionally, climbers may decide to "move together", a risky but speedy technique also called simul-climbing, in which both leader and second move at the same time without stopping to belay. The leader - approximately a rope length above the second - usually places multiple pieces of protection as he climbs so that the weight of the second climber might arrest a possible leader's fall. Should it be the second climber to fall, however, the leader may be pulled from his holds, with potentially unpleasant results.