On this show they make obstacles and ramps out of garbage to "Shred" on them. Usually show has a theme such as be "Green" where they take solar panels and use them to make ramps and power their tools or where they go up to the Sequoia's to a skate camp and build stuff out of the beds and boats in the area. At the beginning of each show they have an advisory not to try any of the stunts they do at home. In expection to that rule they do show you how to make ramps out of wood instead of the insane things they make it out of. (i.e. tanks, rocks, rugs, electronic devices, etc.) Throughout the show the team takes "skate breaks" even though that's what they do through the whole show. The shows time slot is sometimes in the morning and varies throughout the day.

Source: Wikipedia.org