How squishy are these mats? I'm wanting a squishier mat to do more difficult things that you would normally have a mattress for. I do not need that much, but somewhere in between that and a normal mat.

Based on your specifications, I recommend our Folding Landing Mats(https://www.flooringinc.com/gymnastics-mats/folding-landing-mats.html) or our Crash Mats (https://www.flooringinc.com/gymnastics-mats/crash-mats.html). These mats would give you more cushioning for more challenging moves but won't be as soft as a mattress.