If you're at school you can just logon and write a new post. If you're out of school, at home or on holiday you can add a post by email. You can also share a Google doc and I'll copy it here so more people can see it and comment.
Yes. I think that isnt skipping one of the best exercises that you can do for your heart, better than running? Its one of those time honoured traditions where kids just love it whatever the age and its been around for a very long time and I am sure students will be doing so for another 100 years in much the same format!