You need a baton.
You need your legs too.
And last but not least, you need your brains to send out the signals or you're never gonna move from the starting line. Wait, you're never gonna move from where you are right now this second.
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to run the 4X100 relay you need a team of four people. the first person runs 100 meters then passes the baton to the second runner, the second runner runs 100 meters and passes the baton to the third runner, and so on.
you sprint as fast as you can.
in the 4x200 relay race, the fastest man among four will usually be the last runner.