his mom made a change...to swim briefs

As Arnold opens his bag he looks inside only to find his swim trunks aren't there. Instead there's a folded up piece of cloth and a note. As he pulls it out he unfolds it and realizes that it's a pair of speedo briefs. As he unfolds the note he sees "Sorry, your swim trunks had a hole in them...your coach recommended these as a replacement - Mom"

Arnold's face paled. As he stares at the form fitting briefs he gulps. Not having much of a choice Arnold enters the changing stall and puts the briefs on he grabs his shorts and puts them on over the briefs. He then grabs his towel and heads out to the pool where the men's class is gathered. Arnold's eyes widens as he sees the entire class has speedos. Their bulges are prominent and obvious. Coach Mark walks over to Arnold. "Stuart, take your shorts off and get ready to get in the water."

Arnold gulps as he glances over at the women's class. They have a variety of bikinis and one pieces. He recognizes one of the girls as Chelsea and the others around her as girls from the cheer squad. Arnold had a hidden crush on Chelsea but never dared pursue it.

The coach yells again "Stuart come on get those shorts off and get ready to jump in the water!"