
JJ Bruno
Wingsuit BASE jumper (since 2018) and software engineer who built ExitEval, an app for evaluating exits, laser profiles, and FlySight tracks.
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Sep 1, 2026
JJ Bruno: Surfers vs Scientists, Reading the Start Arc, and the Craft of Trusting Your Data
3:45
3:51
4:20
4:31
6:45

Jack PeplowHOST
When people talk about, you know, a good exit, What do you think they're usually measuring incorrectly?

JJ BrunoGUEST
I mean, the perfect exit data-wise is like the million-dollar question, right? I think the most common thing I hear lately is the, what's your cross one-to-one number? Which is basically if you put an arbitrary 45-degree line from the exit, at what point do you cross that in your start arc? So, for example, like, you know, 200 meters down by 200 out.

JJ BrunoGUEST
It's just a little bit late in the start arc for modern suits to be super relevant.

JJ BrunoGUEST
Usually you're probably hitting your cross at anywhere between 8 to 11 seconds in flight, whereas the start, in my opinion, is within the first few seconds.

Jack PeplowHOST
What's the biggest mistake people make when interpreting their in-flight data, do you think? I think that