Ok so here is some good ideas.
1. Open your water bottle slightly and put it in your pe bag. The water will leak everywhere in your pe bag so your clothes will be soaked. so no pe!
2. Make a fake note. etc
Dear Miss (your teachers name)
Y/N can't do pe today as (make up an excuse)
3. Fake messages. Change one of your friends contact names to mum or dad and get them to send you messages about not having to do pe. Show these messages to your teacher.
4. Leave your PE kit at the house. If you wanna be more extreme, take it with you if you get a bus and leave it on the bus.
5. Fake illness. You need to make it seem like your generally sick though.
6. Say you have foot pains etc.