Every 3 minutes for as long as possible complete:
From 0:00-3:00
2 rounds of:
10 Overhead squats, 95#/65#
10 Chest to bar pull-ups

From 3:00-6:00
2 rounds of:
12 Overhead squats, 95#/65#
12 Chest to bar pull-ups

From 6:00-9:00
2 rounds of:
14 Overhead squats, 95#/65#
14 Chest to bar pull-ups

From 9:00-12:00
2 rounds of:
16 Overhead squats, 95#/65#
16 Chest to bar pull-ups
Etc., following the same pattern until you fail to complete both rounds.

Your workout is over whenever you do not complete 2 full rounds of the couplet within the time cap, and your score is the total number of reps you complete.

Scale and modifications: Start at 6 reps of each movement, then increase by 2 reps for each 3-minute section. You may scale the load and the movement.
Overhead squats > Scale load and ROM if you can get at least close to parallel. Otherwise, you may also perform back squats.
Chest to bar pull-ups > Regular pull-ups, banded pull-ups, or ring rows.

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