Surfing 30-foot waves, skiing off cliffs, and biking down the stairs in a Rio slum are the exact kind of heart-pumping insanity that most of us have far too much sense to attempt.

That doesn’t mean you can’t get a glimpse of what it’s like, though.

We found a few crazed adrenaline junkies who’d recorded their exploits using helmet-mounted cameras that let you see their exploits from their point of view.

You won’t get the adrenaline rush, but you will get to see what it looks like — in HD.

These videos were shot using GoPro cameras. Lightweight cameras like these will run you around 300 bucks, but the video footage you’ll get is priceless!

Assuming you survive, that is.

Helmetcam: Surfing a Tube at Sunset

This sequence is shot from surfer Gabriel Villaran’s point of view, using an HD Helmet Hero Cam from GoPro, somewhere in Mexico.

Normally this camera shoots in widescreen, but he used a 4:3 aspect ratio so the top of the wave didn’t get cut off.

960p mode, 1280 x 960, 4:3, 170-degree angle of view, 30fps.

Racing Through the Rio Slums

Mountain-biking brothers Dan and Gee Atherton take a ride through Brazil’s Dona Marta slum in this video of Red Bull’s Favela Bike Race, “Challenge on the Hill.”

The 760-meter course of alleys and stairways dropped through an elevation change of 170 meters. The riders also had to contend with the stray dogs, chickens and humans that call this favela home.

1080p mode, 1920 x 1080 HD, 16:9, 127-degree angle of view.

Helmetcam: Triple Backflip on Skis

Watching this triple backflip from the skier’s point of view captures the skill — and insanity — of this move. The camera was mounted on his helmet somewhere in the mountains of Utah. The skier’s name is Matthias Giraud.

960p mode, 1280 x 960, 4:3, 170-degree angle of view, 30fps.

Facecam: Flying the Norwegian Skies

Neil Amonson flies in his wingsuit. Or is that a “wingnut suit?”

This video was shot in Norway. The camera was mounted using a homemade extension attached to his helmet, so the camera could be pointed back towards Amonson’s face.

960p mode, 1280 x 960, 4:3, 170-degree angle of view, 30fps.

Bootcam: Double Backflip

What’s the big deal about a double backflip when you’ve already seen a triple? Well, this video is shot from the ski’s perspective, adding to the feeling of speed. The camera was strapped to the ski boot for an extra-close view of the snow.

Also: No parachute landing in this one.

720p mode, 1280 x 720, 16:9 widescreen, ultrawide HD with 170-degree angle of view, 30 fps.

Surfcam: Paddling Out at Mavericks

Bart Willems is a 28-year old South African who has been surfing since his early teens. Bart, addicted to mild levels of self-induced fear, decided to paddle out at Mavericks in Northern California on a relatively calm day: The waves were only about 15 feet (which means a 30-foot face from crest to trough).

He recorded his experience in “Mavericks as Experienced by Bart Willems.” It features a song by his friend Jamie Shelly.

The camera was mounted on the tip of a 10 foot, 2-inch surfboard with the GoPro Surf Hero mount.

720p mode, 1280 x 720, 16:9 widescreen, ultrawide HD with 170-degree angle of view, 30 fps.