Starfield Exploring Barren Planets
Image via Bethesda Game Studios

How to Use Up All Available Oxygen in Starfield

You better start running.

Starfield can ask you to do very strange things in the pursuit of progress. Some can involve trying to help someone prevent a vibrating tree from causing serious damage to a city, others can ask you to collect some strange objects that seem to orbit a central point for reasons not entirely clear. Yeah, there’s definitely mystery to this space game. One such request the game makes of you isn’t very clear in its wording, but is easy enough once you understand it. Here’s how to use up all available oxygen in Starfield.

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How to Level Up the Fitness Skill in Starfield

We won’t beat around the bush. The reason you’re here is for the Fitness skill’s level up in Starfield, asking you to use up all available oxygen a certain amount of times to unlock access to the next rank. You’ll notice, though, that when using all available oxygen, it doesn’t count as progress toward the rank up. That’s because the wording is a bit funky.

Related: All Starfield Edition Differences Listed

While it asks you to use up all available oxygen, it actually wants you to use all oxygen and max out your CO2 meter x amount of times. This is the red bar that shows up on your O2 meter after you’ve maxed out your oxygen usage. Do this, and you’ll gain progress towards the next step in the quest.

Is The Fitness Skill Worth Leveling in Starfield?

Since you’re going through this rather strange and tedious process, you may be wondering if the upgrades are worth it. Given the amount of oxygen you can get, along with that crispy upgrade at Rank 4, I’d say it’s worth putting in the extra time. What you lose in time sprinting longer now, you’ll make up for later with more oxygen to run with and less oxygen being spent.

If you’re looking for more details regarding the game while you work through it, check out our guide on how to become a UC citizen in Starfield.


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Shawn Robinson
Shawn is a freelance gaming journalist who's been with Prima Games for a year and a half, writing mainly about FPS games and RPGs. He even brings several years of experience at other sites like The Nerd Stash to the table. While he doesn't bring a fancy degree to the table, he brings immense attention to detail with his guides, reviews, and news, leveraging his decade and a half of gaming knowledge. If he isn't writing about games, he's likely getting zero kills in his favorite FPS or yelling at the game when it was 100% his fault that he died.