We like to refer to this as The Hundred-ish. Only go for as long as you can without feeling excess tension in your neck or back.
Start this in the range that you know you can control the movement without losing your connections.
Use your seat and only go as high as you can to feel your seat working NOT your hip flexors.
This is harder than it looks! Don’t give up - keep persisting and you will be successful.
Go easy with this one. Work on keeping your seat on to support your legs and not losing your center.
Open that tight back with this glorious stretch (hint: it’s not about the arms reaching).