Small 1928 Snapshot, Arms and Legs and Tree Trunks

I really love this little snapshot for the play of all those bare arms and legs, with tree trunks separating each young woman from the next like punctuation. It appears they are wearing uniforms marked with an "H"--perhaps runners on a track team  taking their reward of an end of practice dip.

2 1/2 x 1 11/16 and in good condition. Dated July 31, 1928 on reverse.