On the ground face up
Contract your abs so that your upper back is lifted off the ground
Bend your legs bringing the knees to the chest
Extend them again to complete one rep.
Regarding the technique, extend the arms while protracting the scapulae, so that the upper back is rounded.
For a perfect technique, check that you do not have lumbar curvature and that the scapulae are protracted, at the same time that you contract your dorsal muscles to depress them.
Roger Jimenez front lever set 1
biceps, dorsals, core
triceps, core, obliques