Lenovo says the screen features innovative bonding technology that allows for a strong grip when curled up; that means you can use it during a workout without worrying about dropping it.
Here is the smartphone before bending
This is the Folio concept of Phone to Tablet design. The device can work as either a 7.8-inch tablet or a 5.5-inch smartphone when folded up
SOURCE – CNET, Samsung, Lenovo, Folio