Here is a drill we do at Higher Jiu Jitsu during guard and armbar practice.
It involves a partner acting like a table top. It is best to have your wrists a little further apart than shoulder width, and ideally your fingers are inward facing so that your elbows are outward facing.
From the bottom you will slowly climb from your partner’s lower back to head with your legs, ensuring you maintain the bite of your legs, and thus keeping your hips connected to their torso.
With every step of your feet make sure your hips remain tight and elevated. No lazy hips!!
This drill will equate to an effective bite that is necessary to control posture and space when setting up an armbar from guard.
Let me know what you think!