I'm ready to begin the BBB three-month challenge. All is clear in the Beyond book. No problem. But I seem to recall in a recent thread--which, frustratingly, I can't find!--that someone asked if the 531 sets should stop at the prescribed number of reps, as the book states, or whether they should be PRs as per normal. The replies suggested the latter. As such, I'm wondering if Jim's thoughts on the Challenge have changed since writing Beyond. Should I cap my reps on the 531 sets or for for PRs?