You can safely condition your core, seratus anterior, and intercostal muscles for one arm lifts right on the ground. If one arm strength is something that has intrigued you, read on!
Utilizing a strap or hand loop attached to stall bars or a secure point, keep the free arm next to your ear and compress your legs as tight to your torso as possible while you lift your hips. I was able to do this exercise in straddle and in meathook positions. The key to not flopping over on you side when you train the meathook position is to stay TIGHT through your core, seratus anterior, and intercostals.
Use this video as a guide: