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Two comments and 1 question for OP:

(1) Thanks for the writeup, this is classic HN content, a simple app that solves a person's problem with enough interesting technical detail to make it interesting.

(2) Definitely post this to the App Store! I'd happily pay a few $ for it even.

(3) How would it handle burpees? Would it just ignore the 'jump' phase? But still count the push-ups since it's zeroed in on the up/down motion of the push-up itself?

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Hey thanks for your feedback, it’s really appreciated!

Since there’s interest, I’ll publish the source code to help others learn, and put the app on the App Store for those who just want to use it.

Regarding burpees and other types of motion, I’m looking into their motion characteristics, so that I can include them for detection.

Burpees would likely require recognizing different phases (the jump, the stand, the push, etc) and then when it detects them in sequence, incrementing the count. Something like that, but stay tuned! :)

Makes sense! For burpees, I think the jump part is perhaps 'just noise', in the sense that if you are accurately counting the push-up at the bottom (i.e. can ignore 'the noise' in-between push-ups) then it would work fine. Just a thought.

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