I'm aware that under zero power it is a glider, but there are gliders that sustain flight and have enough lift to climb etc. So, would it not be an interesting idea to make a wingsuit that you can use to climb and not just fall?

With longer wings could it be done? Or maybe a longer airfoil?

I'm aware that under zero power it is a glider, but there are gliders that sustain flight and have enough lift to climb etc (Edit: this is not always true. See below answers for why). So, would it not be an interesting idea to make a wingsuit that you can use to climb and not just fall?

With longer wings could it be done? Or maybe a longer airfoil?