Because of health issues I have not been able to spar for years now, so my MA training consists mainly of solo drills.
Grappling is done with partners when I can and dummies when I don't have anyone available.
Of course I had over 30 years of MA experience before I had to limit myself to solo training.
That experience is what I bring into the drills I do now, stuff I KNOW works because I have done it, repeatably.
Solo drills should come from what a person KNOWS works for THEM, consistently.
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !