I coach a weightlifting club at the School Without Walls - a public high school in Washington DC. The club has grown significantly over the past year, and now they need a club shirt!
The school is often abbreviated "SWW". Because we are a Weightlifting club, I think a great idea would be to include "SWWW" on the shirt. The extra "W" being for "Weightlifting", of course.
The words "School Without Walls Weightlifting" should feature somewhere on the shirt too.
Their mascot is the penguin, so working that into the design is also key. Some adaptation of the penguin - whether flexing an arm or holding a barbell, perhaps looking "tougher" - could be good.
Finally, an inclusion of the DC Flag could be a possible addition to the design. I included a picture of that, in case one was not familiar.