In order to truly master the roll up we need to look at the following things:
the flexibility of the torso
the muscles which let us bend at the hip
the importance of flowing movement
This 8 minute video covers bridges and rotations to mobilise the spine, hip stretches to locate and prepare the vital leg muscles which support us and resistance bands, weights and cushions to ensure safe movements. It incorporates all the mobility and preparation work you'll need and is suitable for most people. Quick tip: Modify the move to achieve a smooth, flowing roll. You should be able to speak throughout the whole exercise.