Check out this cool drill Jiu Jitsu Coach Baret Yoshida does at home to practice armbars using a baseball bat. Play around and figure out some other ways to practice submissions.
Coach Baret Yoshida:
So this technique is the arm bar, so using the bat. I’m going to use the short end facing me this time. And what I do, I bring one leg, one foot under the fat part of the bat, and I bring the other leg over here. Okay?
And, you’re going to kick with the bottom leg while you pull with the top leg here, okay? And I’m going to grab the short end of the bat like I’m doing an arm bar. I’m going to go over the side of my hip here, so I could go to my right side here, or I could even push it over to my left side here. So when you do this, you want to make sure you keep both your knees bent, and pulling your heels in, and you want to drive your hips into this.
Very, very similar to doing an actual arm bar, so you can feel that, so I get my foot under the fat part, and I bring my leg over. Both hands are going to grab that handle like so, and start prying it over your hip here just like an arm bar. Wrap your feet through, pull your knees in, and drive your hips up, so that was the arm bar.