Anyone for the gym?

So, I sauntered off to the gym,
Not really expecting to see a guy named Jim,
Even if many went there for the trim,
It was a feast of muscle filled to the brim.

To some classes, I got to late,
Before to music we repetitively did gyrate,
To exhaustion, we inflate and deflate,
Not once did the trainer berate,

I realised I didn’t know right from left,
My rhythm not anything near deft,
In sweat to my body, my clothes were cleft,
This was before we had much to heft.

For all the sizes there on show,
It was the Muscle Marys in afterglow,
Preening and prancing on the weights with gusto,
A distraction from the general flow.

Some exercises seem so tough,
Tugging on muscles that make you gruff,
With time and grit, you’re trim and buff,
The result of many a huff and puff.