Essentially the technique for the flip part of the skill is the same. The takeoff is the real difference, plus you won't have to try as hard to get the forward distance.
Remember to still set tall - arms up, tuck knees up the same as your back tuck or standing gainer, etc. DO NOT PUNCH A RUNNING GAINER. Use a kick. common problem with running gainers is people forget to go UP still (again, set). and they just sort of run and tuck without jumping. This will end in bad times.
If you can practice at a gym/in a foam pit I highly recommend it first.
Good luck! Train safely.
