Check out Hank’s log. I can’t handle blood very well, and I’ll be scrolling it (it is an interesting log as he tries stuff out fairly scientifically), and the next post will just be a big ol bowl of blood that he drained and weighed. I think the last one he made the observation that pre workout makes his blood flow better in the process of draining, but also made it foamy. I glance at it, and scroll so it is off the screen.
From one of his recent posts about the foamy blood.