Slowly lift leg, control the whole movement and hold the leg in upper position to make it harder. (women-workout-routines.com)
The large Toyota Sequoia takes the same upper position, but it is more simple and affordable. (mywikimotors.com)
That's why I added extra challenge and when legs are in upper position I push buttocks up and backward (like reverse crunch) and I try to hold for a while in the upper point. (women-workout-routines.com)