I've recently started walking outside and wear a sportsbra and tank top for the heat. Is there anything I can/should do to avoid funny tanlines? I'm getting dark tanlines from wearing tank tops. I've thought about finding different tops, like lower chest/back or halter style, but that would only change the lines somewhat (possibly helpful). I've just started applying spf 30 sunblock before going out mid-day.

I'm getting the same thing. I wore a regular tshirt before, then I cut the sleeves out. I just bought some different style tank tops, but you are right - just changes the tan lines. I'm pretty fair, so the lines are noticeable. Sunblock is all I can think of to help with it.

I think dark tan lines mean one thing -- unlazy. It means you aren't planning a tanning bed session into your schedule and are spending that time outside, whether it is gardening or exercise.