When spiders move they just pump blood into their legs. Then they remove blood from their front legs, which drags their back legs forward. Spiders have special grip pads on the bottom of their feet. Some spiders can run 330 times their body length in ten seconds, when humans can only run 50 times their body length in ten seconds. A spider's legs and feet make it agile and fast.
Most spiders use silk to make webs to trap or drop on prey.
Some eggsacs are also made of silk. The mother spider must protect her unborn children in the silken eggsac. Silk is produced by the silk glands and released by the spinners. Next the spider tightens the many hundreds of thinner strands together with spinnerets. Spiders use silk to raise young, make homes, and hunt prey.