During each workout the first week, you do different excersises. The next week, you up the load and do alternating sets. Week 3, you choose different movements for all three workouts. You do these movements again the next week.
Here's an example of how I would set up back movements:
Week 1
Workout A-pull-ups
Workout B-Bentover Rows, palms up
Workout C-1-arm DB Row
Week 2
same excersises, but up the load.
Week 3
Workout A-Wide-Grip Pull-ups
Workout B-Chinups
Workout C-Palms-down Bentover rows.
Week 4
up the load on week 3 excersises.
TBT Log<---I did TBT, here's my log showing how I set it up. Scroll down a bit..