Looks challenging but a lot of fun... What is the name of these rollers? You tried them, and like me you are not a teenager anymore ;-): Wouldn't they hurt the tendon above the ankle? because I guess you need to have you feet turned inside out outside out to roll straight, right?
They are called Free Line Skaters. Watch Youtube how the Asian kids get mad on those skaters. For me it needed nearly two weeks to stand on them, but if you managed, it is really a nice movement. Nothing hurts. Some muscles perhaps as your legs are not used to this side waving movement. The only drawback , if you get some little stones under the wheels you can fall off easily, as your position is not very stable.
Thx.
I had a look: Impressive!
Looking forward to see you on these ;-) !