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I have always thought this video is very informative for if you should be unlucky enough to fall through. I'm a pretty light young guy at 170lbs and 21 years old but I know my limits and know how to read the ice. I've been on ice since I was 5. If I know the pond and it's black ice I'll fish on 2" and feel comfortable. But that's just me. I also like to drill a serious of perimeter holes to mark my "safe zone". As long as I don't go past those I know how thick the ice is and that I shouldn't go through. But like stated. Always try to fish with a buddy. If you're alone always have picks, some sort of rope and a change of clothes in the truck is never a bad idea.
Be safe out there everyone. Use your heads, be aware, stay dry, but most importantly. Have fun and tight lines!