Hot showers help.. working out, especially outdoors if its warm/hot outside... drinking lots of water.. and tying off, putting as much pressure as you can on the area you tie off and flexing your arm, leg, etc.. before really tying off, as much as possible to achieve more pronounced veins to shoot into.. because I am rather slim, due to a very fast metabolism, I cannot gain too much weight.. I have actually tried to put on some weight, but because of this, I usually don't have too many problems finding a vein, and I have been slamming daily for the past 3-4 years.. more like 4 though, as of lately I have had a bit more trouble finding a vein, because of a new job, and how I have to wear a uniform, which consists of a short sleeve t-shirt.. I cannot shoot into many veins I used to use everyday, anymore.. it sucks, because I sometimes have NO CHOICE! I have to shoot in spots where the tracks can easily be seen.. but when I do, I always have my arms kind of "hidden" where the tracks are.. I dread one of my managers seeing my arms, with bad tracks on them, due to having to shoot up in noticeable spots.. I already know one day they already have seen them, or are going to and say something.. last week I had bad scars on my arm, near the crook.. it was so obvious, and no one said anything.. so for all I know, I work with a bunch IVDUs lol.. But OP: some of my friends that are a bit more, big boned or heavy, they will have lots of problems finding veins, I have watched them sit there for over an hour some days trying to hit veins that just weren't showing... so they resorted(and this is a LAST resort too.. not advised, as it is more dangerous)to shooting in their jugular vein.. on their neck.. after desperately trying to find a spot on their arms, legs, and feet for hours at a time, whilst be in withdrawl. be careful, and definitely give those tips at the beginning of my post a try before resorting to shooting into veins like you jugular, its not safe to shoot there, especially just using a mirror.. if you ever do that, make sure you have someone do it for you or at least guide you through it and to make sure it goes ok, so they can be there if anything went wrong.. that is a last resort option! Be careful man, hope this helps..