What are the keys for a heeler coming out of the box in team roping?

The heeler's job out of the box is fundamentally different from the header's, and riders who don't understand that distinction are going to struggle regardless of how good their horse is. The header is chasing and creating — he's going after the steer and setting up the run. The heeler is reading and reacting — he's watching the steer, watching his partner, and timing his entire departure around what's happening in front of him. Coming out too early is a barrier penalty waiting to happen. Coming out too late means you're running hard to catch up and throwing from a bad position. The heeler's box is a chess move, not a foot race. The heeler's departure is triggered by the steer crossing the score line, but the actual timing of the nod and the gate is built around reading the header's run. A header that gets a good shot and a clean catch pulls the steer around quickly — the heeler needs to be moving by then, positioned to follow the steer as he straightens out. A header that's chasing and scrambling means the heeler has to adjust, stay patient, and not commit until the picture is right. What you want out of the box as a heeler is a horse that leaves smooth, straight, and adjustable. You don't need maximum speed immediately — you need a horse that gets up to speed efficiently and can rate once he finds the steer's hip. A horse that launches out of the box at full throttle with no rate is going to overrun the steer's hind feet every time, which is the one position from which you absolutely cannot make a good throw. Speed for the heeler is about closing distance efficiently. You're not racing the steer — you're positioning yourself to deliver your loop to the hind feet as they come off the ground. That requires arriving at the right place at the right time, which means your horse needs to be adjustable even at a hard run. The great heeling horses in this sport have that rate built in — they find the steer's hip almost automatically and put their rider in position to make the shot.