Nothing special ... For the fretting hand , always have short nails , and avoid chewing the skin at your finger tips to always have them strong enough for bending and sliding stuff.
Same applies to picking hand if you're into finger tapping.

When the weather is a little cold , I blow hot air from my mouth into my both hands and rub them together before warming up with chromatics.

In John Petrucci's video , he explain some exercises for the hands , but I don't find them necessary at all.