There are plenty of smart wearable trackers for cardio. Delta Gloves are designed to track your strength training sessions. They combine audio with haptic feedback to keep you on the right track. These gloves can track your sets, reps, and exercises. More advanced users can monitor power, velocity, and explosiveness.
The glove has a puck with an accelerometer and gyroscope to identify patterns for each exercise. It connects to your smart devices via Bluetooth. The battery lasts 5 days.