Sportiiiis HUD display Review

4iiii Sportiiiis Review
The hardest thing to learn about running or biking is being able to keep at a good pace. If you can’t keep at a good pace you will burn out quickly or you will need to run/bike forever for it to be a workout. This is always a challenge because it takes lots of time and practice to figure out what your heart rate should feel like, and even more difficult sticking to this once you are going.