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Particularly useful for those who like to run off-road or on hilly terrain, Stryd’s tiny running power meter device provides real-time feedback via a compatible Bluetooth smartwatch or smartphone, letting you know exactly how much effort you’re putting out. Stryd Next Gen, the latest version, clips on to the wearer’s shoes and wirelessly detects running dynamics like cadence, power, stride length, efficiency, and leg spring, but it also now computes the effect of wind resistance on the athlete. This helps runners understand the impact of drafting, how much work they’re actually putting into a headwind, and how a tailwind affects their pace. While Stryd is an excellent training tool, long-course athletes would do well to use this device for maintaining actual proper pace on race day—helping take into account all outside factors.