Theragun Mini

It's got the same power as Therabody's expensive models, just in a compact package that won't tire out your arms. Use it for 10-20 minutes on problem areas—neck, shoulders, calves, wherever you're tight—and you're done. Customers say it's become their most-used recovery tool because it's always with them and takes zero effort.

Fair warning: once you own one, you'll wonder how you survived without it.