Hey bro, here's a tip you can do...Take your 125# DB and if you wanna do say 150#, take a 25# DB and place it across the 125# so that the handles are perpendicular and so that the 25# is on top of the 125# this way you can grab the 125# with your 4 fingers and use your thumb to stabilize the 25# and there you go, 150# DB's. It may be easier to use a strap, but either way that's an option for you if you wanna go that route