Looking for some guidance. I have personal training group with 5 teenage girls (aged 14). They come to me for an hour on sunday morning and chat more than they exercise. They come to be voluntarily, i dont want to be this strict teacher and 'punish' by saying ok you spoke so give me 20 extra pushups. I already give them regular water breaks where I say ok to speak, but even with those the chatter levels are insane!!

Any ideas gratefully received..