What equipments you don't trust before but turn out to be helpful for your workout?

Hello, everyone.
Do you you have something that you do not trust before but turns out to be great?
I started seeing ads about massage guns of all kinds one years ago and I, to be frank, did not believe massage guns are as good as it’s said in the ads.
The funny thing is I backed one massage gun on Kickstarter last year and it greatly helps me relieve the soreness. And one month ago I bought another massage gun. LOL.

When I was younger I never trusted turbores but it turns out that they are quite useful for a workout :roll_eyes: