The Saw
The Saw adds SPINAL ROTATION to a forward reach, working the obliques, abdominals, and back extensors while improving rotational mobility. Seated tall with legs wide, you rotate your torso to one side, then round forward to 'saw' your opposite hand past your little toe, then restack and repeat the other way.
FilmableFilm this on your phone and TrueForm measures your body mechanics and tells you what to fix. You get angles, not a made-up score.