Anyone that know how to do stomach vacuums?

[Belliebella]

so i did my first workout with stomach vacuum today and im a bit unsure if i did them right or not. So what i did: hand on my hips, inhale as much air as i could. Holding my bellybutton towards my spine while exhaling the air, and holding it for 20 min while breathing normally.

Where are you supose to feel it? I felt it in my lower back

[nalaa]

well the way I do it is to exhale all the air first before sucking in my stomach until I have to breathe and repeat a few times.
but I think the essential part is to contract your muscles for a good while.
You should be feel it in your stomach. You'll feel it in your lower back if you have weak muscles there or you're not entirely straight

[Belliebella]

ok, i'll try to make sure to be straight next time.. and i'll try to do it your way