Core 1
uap-pre-season-2

A1. Deadbug

Maintain natural curve in the spine
Move slowly with core conrtansly enganged

A2. Flat Lateral extension

This position is most easily obtained with a partner sitting on your feet. I have also done it hooking my lower foot under a 60 pound dumbbell on the bench.
Maintain constant tension in the obliques as you lower yourself toward the floor. Bring yourself up to parallel or above parallel as you are able.

A3. V-ups

Move under control with core engaged
Aim hands to mid calf or above
Move arms and legs simultaneously