How well do these hold up during workouts?

You wont really be able to break them. They are very well made. However, depending on your ear shape, they may not stay in very well. It is important you do the whole insert and twist move or they will just fall right out.

Questions & Answers: Sennheiser M3IETW BLACK Momentum True Wireless Earbuds

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Sennheiser M3IETW BLACK Momentum True Wireless Earbuds

Bluetooth 5.0 compliant Wireless Technology and Qualcomm aptX Low Latency support
High quality voice pickup for phone conversations and voice assistant access is ensured by 2-micbeamforming technology
Improved situational awareness: The Transparent Hearing feature lets you hear your surroundings and easily have conversations without removing ear buds
Up to 4 hours of battery life, extended to more than 12 hours with on the go charging via compact case
Personalize your audio experience with the built in EQ via the Sennheiser Smart Control app

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