I use a VPN when at the gym (well, when I *used* to go to the gym...) because the gym's WiFi blocks some sites that I like to visit.
I use the same VPN when I travel internationally (again, back when I was doing that several times per year...) because it allows me to access sites that I would not be able to otherwise. Netflix, Comcast Live Stream, stuff like that.
Having said that, never use free VPNs and always choose your VPN provider carefully. Your VPN provider has direct access to everything you do; this is not the place for a Chinese freebie.