This might be a good one to try for those of us who go to the pool...
The Float Test
This is a very, VERY rough way to estimate your bodyfat using water.
This test is done in fresh water or in a swimming pool as floating in salt water (seawater) will change the results. Salt water helps you float better, skewing the results.
- Take a deep breath and float flat on your back in deep water.
- If your whole body floats (i.e. your legs don't sink), you are probably over 25% bodyfat or more.
- Blow out all your air. If you still float at about the same level, you are probably 30% or more.
- If you can float with a breath but your legs start to sink slowly, you are probably around 15 to 20%.
- If your legs sink quickly and you float vertically underwater but near the surface with a deep breath, you are around 10 to 15%.
- If your legs sink quickly and you sink to the bottom with a deep breath, you are probably between 5 and 10% bodyfat.
- The faster you sink, the lower your percent bodyfat.
This works because the density of fat is less than water while the density of muscle is greater than water. More fat makes you float while more muscle makes you sink.