Entry option 1: the base places the toes under the flyer's sit bones while the flyer stands near the base's hips, then the flyer jumps up in sync with the base extending the legs to vertical.
Entry option 2: the flyer stands at the base's head, facing away, while the base places the feet under the flyer's sit bones and grips the flyer's ankles. The flyer leans back as the base pushes up and lifts them.
The base moves the hands to the flyer's feet. At this point the flyer should be mostly standing on the base's hands, only balancing on the base's toes.
Using a Hand-to-hand grip , the base pushes the pointer and middle finger knuckles into the soles of the flyer's feet, while the flyer presses into the balls of the feet, lifting the heels.
Once stable, the base can remove the feet from the flyer's sit bones.
To exit, the base places the feet back under the flyer's sit bones and lowers the flyer's feet to the ground.
Form tips
You can use a Hand-to-hand grip or a C-grip on the feet here, but the hand-to-hand grip is commonly preferred.
The flyer keeps the "high heel" position, the chest and gaze forward, the hips pressing forward, and the Glutes and inner thighs engaged.
