Isometric holds core
2 rounds: 20 seconds on 10 seconds off
Low plank
High plank 
L. Side plank
R. Side plank
Deadbug
 
Isometric holds lower
2 rounds: 20 seconds on 10 seconds off
OHS (air squat)
R. leg airplane
L. leg airplane
Wall sit
 
Isometric hold upper
3 rounds: 20 seconds on 10 seconds off
HS hold on wall
Dead hang from pull up bar
 
Coach led stretch