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Using the very portable KF4 for swimming training

  • Apr 5, 2018
  • 1 min read

Updated: May 10, 2018

Coach adjusted the countdown from 30 to 40 seconds. The countdown can be changed from 1 to 99 seconds.


 
 
 

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© 2018, 18 March. Proudly created by Keng Yang & Fanxun

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