Having your leg “pop-up” at the beginning of a get-up is due to a poor connection within the front side “X” of your body.
Remember that getting up to your elbow isn't about doing a sit up, it's about rolling and connecting your working shoulder to the opposite hip.
That “leg popping up issue” can often be easily solved by re-establishing the connection with your front side “X” through segmental rolling.
In this video, I'll show you how that's done.
For more on Kettlebell Training, check out my Hardstyle Essentials 17-Video Instructional Series that comes as a FREE bonus with Kettlebell Evolution Advanced Fat Loss Program – http://kettlebellworkouts.com/kbevolution