Instead of trying to draw as many dynamic poses as possible, I thought I'd take a crack at drawing the default pose using Marc's anatomy proportions layout. Its basically the same as the Loomis method, except I prefer the Cranial by Robert Beverly Hale.
You can definitely notice my lack practice when it comes to muscle anatomy especially in the abdomen area. Having watched Rey Busto's class on anatomy, I'm familiar with where the origin/insertion points are and what are the general shapes of the muscles. The most difficult area to nail was at the point where the Serratus, Obliques, Lats and Pecs overlap. I should definitely do more drawings that is specific to my weaker muscle points instead of sketching whole poses.
Another of my mistakes (or lack of awareness), was correct scaling and by that I mean when I first sketched the male figure, the body overall was very narrow. This probably due to the fact I've gotten a lot more comfortable drawing female than male anatomy, and subconsciously sticking to the proportions of drawing the female figure (example: the ribcage is two cranial units wide, but in the male its usually 2 and half cranial units, to account for the wider thoracic arch). In this case however went with one and half cranial units wide for the female and two cranial units wide for the male. There's definitely a lot more I learned from this, but I don't want to drag this out for too long.