You likely will not get the opportunity to lift during CBT. The only chance you might get would be near the end of second detail, in which your squad leader might make use of an extra hour or two of time after dinner in Arvin (the gym) to familiarize y'all with the IOCT and perhaps to work out.
Work-outs during Beast are organized and conducted in the mornings. They consist of rotating muscular strength/endurance (MSE) days and run days.
- MSE: circuits of push-ups, sit-ups, pull-ups, dips, and ankles-to-the-bar
- Run Days: Ability groups at a given pace ranging from 9-10 min/mi to sub-6 min/mil; increasing mileage over CBT
Hopefully memory is serving correct for the above descriptions. Perhaps someone with more recent experience in CBT can chime in.