Ability to sit and rise from the floor as a predictor of all-cause mortality

One of my hobbies is "acrobatics" and I am able to rise with no support by using my forearms as a counterbalance. To add weight to this counterbalance I must sometimes swing them a little. I also sit at the bmi limit of underweight/normal.

A visual guide to how the research study assigned points to the subjects by ability:

https://www.youtube.com/watch?v=pv9HlxskZjw

This is good to hear. I can rise with no support (8-10). It gets my heart going for a few strokes.

I appreciate the result, but this test is heavily biased against certain builds. I weigh about 280 pounds, and the distribution of mass and the girth of my trunk basically make it impossible to balance while sitting or standing up without using a hand for support. This is regardless of how strong or agile I might be, and despite my otherwise fine cardiovascular health. I'm not sure the researchers accounted for builds like mine.