I think you've hinted at it, but years ago I was interested in learning how to draw and was given the advice of drawing poses on a timer (I think it was 120s but the goal is to eventually get it down to 30s or less).

There were websites back then which would automatically flip to the next pose once the timer ran out, you'd have to start a new page and sketch it out again.

If you do this for even 10-15 minutes a day every day, you eventually start to see an improvement on your ability to draw poses (starting with picking up on which lines are the most important to convey a silhouette, eventually moving into things like muscles, bone structure, etc.). You can even refer back to your earlier drawings to see the progression.

I never got any good because I didn't stick with it, but I did get a lot better than how I was when I started.