Gymnastics rings, on the other hand, are separate. You can hang them both from a bar or rafter overhead, and put your body between them—for example, to do dips. You can’t do that with TRX.

How does scoring work? Each score is a sum of two separate components: the execution score (E-score) and the difficulty score (D-score). The E-score begins at a 10.0 for each gymnast and decreases ...