Ten minutes, start to finish
How It Works
With guidance, you’ll sit down in warm water, exhale out and gently submerge underwater for about five seconds. That’s the whole test.
View Our CalendarWhat actually happens
Five steps and you are done
Almost everyone arrives a little unsure about the water. It is worth knowing exactly what the ten minutes consists of before you get here.
- You arrive and change
You arrive, change into your swimsuit and will be guided step by step. Bring a towel — you will get completely wet. There is nothing to fill in on the day; your booking is already on the roster.
- Record dry weight and height
Your weight on land, plus your height. Those numbers are part of the scientific calculation that produces your result.
- Step into the tank
The water temperature is kept between 89 and 92°F, clean and warm. You step in and sit down on an underwater scale.
- Exhale forcibly, gently submerge
Forcibly exhale 95% of your air above water, submerge gently and force out the last 5% of your air. Hold still for two seconds. Two knocks means come up — and of course you can come up anytime you need. We will do this at least two more times.
- Results before you leave
Your fat mass, lean mass, a calculated resting metabolic rate and your history, printed and in your hand. Ten minutes, start to finish.
Step by step, with Linda
An expert guide, there with you in the mobile lab
Linda is an expert guide who will take you through, step by step, to get the best results possible. You might be underwater for five seconds or less. The world record is 29 minutes! For sure this is an odd effort, but not impossible. Join the thousands of people who know. 🤩
Five seconds, up close
This is what an actual test looks like
Everything else
Frequently asked questions
Before you arrive
Reminders Before Your Test
Five quick reminders help keep your appointment smooth and your results accurate.
- Bring a swimsuit and towel, you will get completely wet.
- Please be on time.
- NO food within 2 hours of testing.
- NO hair products of any kind.
- Please rinse off if you are very sweaty.