Sportswear with built in electronics
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My idea is to create sportswear with built in flexible electronics to monitor an athlete's biological indicators, like pH levels in sweat, heart rate, or blood pressure, generating data on metabolism or other factors and beaming it wirelessly to a trainer's laptop. The electronics could also simply count the steps to measure the distance traveled or the number of reps completed.
Having such a sportswear will remove the need for some clunky external device to record or transmit similar data.