You are talking about floating on your back. I'm talking about bobbing. As long as you hold your breath, your head will be under the surface... Unless you're bu

You are talking about floating on your back. I'm talking about bobbing. As long as you hold your breath, your head will be under the surface... Unless you're built like a brick I guess. But a brick with lungs. Hold full breath. If even that doesn't work then I guess swallow air and try not to burp or fart?