Practice at home

Hey!
First time here...
I'm from Israel, and I started a 5-day surfing course four days ago.
First of all - surfing is really awesome! I love that!
My problem.
The instructors gave us "homework" to do at home - 30 pop-ups on the floor every evening. I'm doing it and I'm doing it pretty good, but I want another things to do at home. I'm still a complete newbie and I don't have a stick, and I'm about 10 km from the beach.
Do you have some other techniques I can learn at home and then try on the board?
Thanks!
First time here...
I'm from Israel, and I started a 5-day surfing course four days ago.
First of all - surfing is really awesome! I love that!
My problem.
The instructors gave us "homework" to do at home - 30 pop-ups on the floor every evening. I'm doing it and I'm doing it pretty good, but I want another things to do at home. I'm still a complete newbie and I don't have a stick, and I'm about 10 km from the beach.
Do you have some other techniques I can learn at home and then try on the board?
Thanks!