Univocalic (I): Gym Tricks

I spy its sign:
'MISSISSIPPI GYM. TRY GYM TRICKS!
Bring drink; bring gym kit'.
I think I'll visit it!
I spy kids sprinting, flipping, twisting!
In pink, girl child swings;
high flight; flippy twist; stick!
First trick: I climb.
I swing—
skin rips!
I try rings.
Cling, swing; fix limbs still.
Flip... SIT!
Sigh.
I'm trying!
This fit kid sprints;
sticks his skills;
shifts his limbs;
flick, twist.
I might try twisting.
I sprint. I twist my hips.
PING! In pit.
Sprint, twist, spring, twist!
I grin dizzily.
I hit SKILLS!
Right.
Spriiiiint.... ziiiiiip... sliiiiiip...
TRIP!
I hit my shins!
I bit my lip!
It stings.
I drink; I think.
I'll try drills.
Sprints, kicks,
leg lifts;
climb, spin,
I hit it!
I'm fit!
Flippy, twisty, spinny flight!
MISSISSIPPI GYM first visit:
slips, spills, twists, drills;
I'm winning!
(I think...)