Super-light over-the-ear headphones with wireless Bluetooth and wired connections.
Music tends to make exercise, or pretty much any activity, much more tolerable and a good pair of headphones can be key, especially if earbuds don't fit your earholes. This set sits lightly on your head and ears so you don't feel like you're wearing a helmet. The wireless Bluetooth connection lets you play, pause, or skip tracks using buttons on the headset without needing to mess with your phone.
I also wear them anytime I do yardwork, a.k.a. NEPA, although 90 decibels from Metallica is technically the same as 90 decibels from a lawnmower, which may or may not defeat the purpose of "ear protection." – Chris Colucci