Answer:
Old Mcdonald had this
What you become during a workout?
Glittering points that downward thrust. Sparkling spears that do not rust. What is it?
Even if you throw it away, it still comes back.
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?