Yo! I totally feel u on this... gym gear basically has to be bulletproof. Sony has tons of models, but many aren't built for high-intensity. Basically, lifting and cardio mean lots of sweat and jerky motions, so if ur gear isn't IPX rated or super light, it's gonna break or fly off ur head during a burpee! For your situation, here's what I recommend:
- Sony LinkBuds S Truly Wireless Noise Canceling Earbuds: These are literally the BEST for sprints. They’re so light you forget they’re there, and the fit is SO snug.
- Sony WF-1000XM5 Truly Wireless Noise Canceling Earbuds: Fantastic sound, but they’re a bit bulkier. I think they're okay, but LinkBuds S feel more secure for cardio. Honestly, skip the over-ears like the Sony WH-1000XM5 Wireless Noise Canceling Headphones for the gym. Go with the LinkBuds S and ur good! gl!

Like someone mentioned, those high-end flagship models are great, but I honestly think spending $300 on gym buds is a bit much. Between the sweat, gym chalk, and the risk of losing one under a rack, you want something that works without the massive price tag. I am gonna disagree with going for the XM5s or LinkBuds S when cheaper options do the job just as well. I usually suggest these for a more budget-friendly setup:

• Sony WF-C700N Truly Wireless Noise Canceling Earbuds: These are way lighter than the XM5s, which actually helps them stay in your ears during burpees and sprints. They have decent ANC and IPX4 sweat resistance too.
• Sony WF-C500 Truly Wireless In-Ear Headphones: If you dont care about noise canceling, these are basically bulletproof and super cheap. Basically, the C700N is the sweet spot. You get the Sony sound and a snug fit but wont be devastated if they get banged up. Not everything needs to be top-tier to survive a heavy lifting session, you know?

Honestly, if youre doing high-intensity cardio and burpees, reliability and mechanical stability are everything. You dont want a driver failing because of moisture ingress or a heavy over-ear sliding off. Tbh, those big flagship models have too much mass for jerky movements. Here are two technical alternatives that prioritize safety and reliability:

• Sony Float Run Off-Ear Wireless Headphones
• Pros: This design is basically unshakeable for sprints. Because they use a neckband and sit off-ear, they dont trap heat or sweat. Mechanically, they are much more stable than buds that rely solely on friction in the ear canal.
• Cons: The 16mm drivers sound decent but you lose the sub-bass because theres no seal. Also, people around you might hear your music if you crank it.
• Sony NW-WS623 Waterproof Walkman
• Pros: This is the gold standard for reliability in high-moisture environments. Its IP65/68 rated, meaning it can literally be submerged in salt water. If you sweat a lot, this is the only one I would trust not to short out over time. Plus, the wraparound design keeps it locked on your head during burpees.
• Cons: The audio quality is a bit dated compared to the newer chips, and the controls are all physical buttons which can be a bit fiddly until you get the muscle memory down. I think the Float Run is the way to go for the most intense stuff. Its basically impossible for them to fall off or break from sweat buildup, though the Walkman is technically tougher if you're realy drowning in sweat.

This ^

Can confirm this works. Did the same thing on mine and its been solid ever since.

Just wanted to say thanks for everyone chiming in. Super helpful discussion.