Saw someone post this link earlier: http://www.drbop.com/newbop/contents/24combs/24combs.htm

I thought I'd give it a go. It says everything has to be played legato. I got to the 2nd combination 1243 and I'm already swearing at my guitar. How the hell am I supposed to play that legato. All these combinations make much more sense played all alternate picked I don't get it.
This isn't intended to make you play better or faster, it's to create strength in your fingers and make them more versatile. It makes for a good warmup too
Start out really slow. REALLY slow. Aggrevatingly slow. So slow it makes you feel despressed. Use a metronome and speed up only when you have absolute control over the movements. Your future you will thank you.