Best Fitness Trackers for Swimming

Swimming is the hardest workout for a tracker to handle, because water blocks the optical heart-rate sensor and the device must survive submersion. A swim-capable tracker needs specific features.

Water resistance first

Look for at least 5 ATM water resistance, which means it's rated for swimming. A watch rated only for splashes or shallow water won't survive regular pool sessions.

Swim-specific features

• Stroke detection and lap counting
• SWOLF and pace metrics for swimmers
• Open-water GPS if you swim outside

Lap counting and stroke detection are the features that make a tracker useful in the pool. A basic waterproof band without these just gets wet without telling you anything useful.

What to know

Optical heart-rate sensors don't work well in water, so wrist-based heart rate during swimming is unreliable. If accurate swim heart rate matters, you need a chest strap designed for swimming.

Buy a tracker with 5 ATM resistance and swim metrics if you swim regularly. It turns pool time into tracked, measurable training instead of just getting wet.