Last night I worked my biceps and abs really well and today i feel it in my arms but also my legs are so tired

why? Just from standing and lifting the 10kg weights?
Answer:
It is indeed possible for your legs to get sore from work that your upper body has done- especially if you didn't stretch first.. Or if you weren't wearing good shoes.A kg is about 2.2 pounds. So each weight would weigh about 22 pounds. That can get pretty hefty, especially in extended work-outs. So it's not too surprising that the rest of your body got a bit of a work-out too.

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O yeah.. or you are just aching alll over because you worked out hard.

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they are tired because they got a good work out. Its good.

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