When tennis racket swings the height will change. So a pressure sensor BMP390 is able to give you information how the racket moves from low to high or from high to low in real time. BHI260AB is able to give you information about how the racket rotates in real time.
If you want to recognize some motions like lunges, squats, etc. then BMA400 is not enough. BMA400 is just a pure accelerometer that measures all mixed accelerations such as linear acceleration, gravity and centripetal acceleration, etc. You may consider BHI260AP sensor that has AI algorithm running inside for cyclic gesture recognition.
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