Best Sensor/Sensor Combo for Measuring Speed of Punch (Adafruit nRF52840)

Hey y'all, so I'm super new to Arduino (and coding in general), but I'm trying to figure out the best way to measure the speed of a punch. To explain, I'm in a wearable technology course and I'm trying to make a glove that measures the speed of your fist during a punch and turns a series of LEDs red if the punch reaches over a certain speed.

Our class uses Adafruit's Circuit Playground Bluefruit (CPB), which I know is incredibly limited, but I've also got it hooked up to Adafruit's Crickit, if there's something motorized that can help. The CPB has an onboard accelerometer and I have access to external time of flight sensors, ultrasonic sensors, and I think a GPS sensor (there may be more, but these are the ones I know of).

I've read through the forum a bit, so I know the accelerometer on it's own won't be much help, but I'm wondering if anyone has suggestions otherwise? Or if anyone has made something similar and found one sensor to be easier than another?

Thanks!

Becky Stern (Adafruit, youtube, beckystern.com, et c.) did a project with "velostat" (???) which is a material that is placed where pressure will be felt. The resistance between top and bottom surface decrease as pressure increases. Perhaps whacking that with known speeds will give you a slope to interpolate other speeds?

Her "firewalkers"...

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