Squats are great for overall strength and five reps hit the sweet spot of absolute strength and strength endurance.
For the metcon, you’ll build an ascending ladder of thrusters and HSPUs, but the double unders will remain constant. Your score will be total rounds and reps.

Strength

Back Squat
5, 5, 5

Conditioning

AMRAP in 15 minutes:
1 thruster, 115/75#
1 HPSU
20 double unders
2 thrusters
2 HSPUs
20 double unders
3, 3, 20…4, 4, 20, etc.