JBL Charge 4 Waterproof Portable Bluetooth Speaker
The JBL Charge 4 Waterproof Portable Bluetooth Speaker ($140) can connect to two smartphones or tablets at once, so you and your roommate can take turns curating your workout playlist. According to the brand, this device (which comes in 12 colours) is waterproof, so there's no need to stress over a water bottle spill or some light rain during an outdoor workout.