Staircase to nowhere

 Trying to do a diagram a day which usually takes a little over an hour, depending how complex it is. This one took me longer than usual since I tried to make the lines really precise and accurate, probably about two hours. The top-facing planes are shaded in red, the ones above the horizon line are not visible realistically unless the whole thing was see-through, which is what I did here.

Starting to get back into working out again lately, I think I worked out 5 days out of the past 7 so that's a start. Not that I wasn't working out before, but it was only a couple times a week.