Straddling is safe with grips each side secure. But progress requires the flip flop position, secured on one side or the other, not looking down or back.
Note: The words here are simply delightful and deserve to be played with. Straddling with a foot in both camps is secure but precarious, as lifting one foot to swing over the fence is iffy and risks being impaled on the fence. Climbers straddle obstacles but only makes moves when three grip points are secured. Think in three’s not two’s on three legged stools.