Reddit reviews KLB Sport 27" Adjustable Exercise Equipment Step Platform for Sports & Fitness (Black & Grey)

There are different ways to teach contact obstacles. For a fast dog with a novice handler, "2 on/2 off" can be the most useful.

Basically you teach the dog to orient themselves with their front feet on the ground and their back feet on an object behind them (hence "2 on, 2 off"). This is because "touch the yellow part of the plank before you jump off" is a difficult and vague criteria for a dog to learn, but "run to the bottom of the plank and WAIT THERE until someone tells you to go" is pretty straightforward.

If you can build or buy one, a travel board is great to get. They're small enough they can fit in the trunk of a normal car. You can take it with you to new places and practice the 2o2o behavior in lots of different environments. It seems like a random skill, but it is hugely, enormously helpful to have a strong reinforcement history for the 2o2o behavior - it will give you a lot more control on course and will help ensure safe behavior from the dog on contact obstacles.

Here's a video about how to teach the 2o2o behavior... the video shows teaching it on a more expensive piece of equipment - you can teach it on anything that's raised! Aerobics steps are great for teaching this skill without sinking a lot of money into it.

Edit: here's my young dog when he was learning his contacts... we weren't running courses, we were just practicing being calm and controlled over one obstacle at a time. :) You can see the strong stopped contact behavior is the only thing that allows us to do that.