Andrew Huberman· PhD
making sure that your belly button is still facing Direct directly forward this is really key not twisting the Torso but making sure that your belly button is facing directly forward and doing curls one arm then the other arm one arm then the other arm then switching to a stance in which the other foot goes forward and the other foot goes back again make sure that you're not in a CrossCountry skier position with the feet very close to your midline because if they are you're not going to be stable so make sure that they're far enough away from your belly button on either side that there's a bend in your knees so that you're stable and then doing curls that way