Listen don’t trust me but i honestly think C
Answer:
A time when they are green, a time when they're brown, but both of these times, cause me to frown. But just in between, for a very short while, They're perfect and yellow and cause me to smile!
What am I talking about here?
<span>To get the most use from your exercise, stay in your target heart rate range for at least 20 minutes during an exercise session.</span>
