The one rope exercise is deceptively simple: have your partner hold the bight of your rope, then wrap the rope around them and unwrap it.
It’s a popular exercise, however, because it’s such a good way to practice your fundamental skills. One of the best riggers we know practices this exercise for five hours a week—that might be excessive, but it’s one of the best ways we know to improve your tying.
Work on your fundamentals:
Can you tie while blindfolded?
Does a blindfold improve your tying?
Practice active bottoming:
How does a blindfold change the sensation of being tied?
This is an infinitely adaptable exercise: