Yep, it could include all kinds of hormones, DNA, growth stimulants and/or suppressants, all kinds of things (has no idea what the real world limitations are, is just jumbling in ideas here hoping they sorta work). Drugs would be speed-healants too. I just thought that plus some surgery would be the best option since its the least fantastical/sci-fi-ey and there seemed to be a preference to not go there.<br/><br/>So my vote is drugs/surgery #1 and bio-chambers in #2 place.