I crack my middle and ring fingers at the same time on each hand by curling them and grabbing them like a knob with the other hand and bending the curled fingers backwards.
For my pinky fingers, I usually stretch the thumb from the same hand until it's on the back of the pinky and press it down into my palm, but that doesn't always work. If not, I'll just use my other hand to press on the pinky until it cracks.
Index finger is same method, but has a higher rate of success due to close proximity to the neighbor thumb.
For cracking the thumb, I tuck it into its own palm, close the rest of my fingers over it, and then clench the thumb into the palm until it cracks.
With each finger cracking session, I also check to see if my wrists need to be cracked. Left wrist has much higher success rate but to do it, I wedge my index or middle finger into one side and my thumb in the other, and then bend the wrist towards me.
And from there I try my elbows, which is easily accomplished simultaneously by stretching my arms outward and trying to bend my elbows the wrong way until they snap.
Capping off, I may try my back, which usually cracks as much as 5 times at once by clasping my arms back to back against my spine and simultaneously pushing my arms towards my ribcage and reclining my back against my arms.
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