Exercise stick trains your muscles with light-based feedback
 

Of all the products ripe for technological gimmicks, training gizmos take the (low-fat, sugar-free) cake. That said, a new gadget called Axon does look pretty cool, if you're willing to risk Kickstarter. It's a stick that resembles a stout pool cue,...

https://www.engadget.com/2017/07/19/...ased-feedback/