I'm registered for 3 carbine classes this summer. 2 of them have pistol components. There should also be vigorous activity and going prone/shooting on the ground in other positions. I'm going to use my G29 for these classes but I don't know what kind of holster to get. I have a IWB holster for CCW, but I'm guessing that wouldn't be a good choice for this kind of shooting. I also have an OWB Galco with a thumb break for the gun. What kind of holsters do people usually use in these situations? I don't want something where my gun is going to fall out as I run or drop to the ground.