Ok,i'm a total hardgainer and what works for me has taken years to develop.
I started with a pure bodybuilding approach and over the years went from martial arts to military training to swimming and running.At the moment i'm not that big but i've just started up again after a fair break.Anyway,if you want a hard rewarding SIMPLE,NO FRILLS workout,try mine for a few weeks.
20 mins hard run(as fast as you can OUTSIDE not on a treadmill)
Straight after do the folloming
2mins pullups
2mins pushups
2mins situps
No rest between sets and work hard.
20 rep squat at about half bodyweight(you legs will be tired from the run)
3 sets dips with weight(for 8 to 12)
3 sets pullups with weight(for 4 to 6)
(superset the dips and chins with no more than 30 sec rest at any time but aiming for none)
2 sets side bends for 20 reps with weight.
manual resistance neck work 20 each way.
The aim is to have no rest other than the time it takes to move things or get from one station to the next.
have a wee run on rest days or do some bodyweight circuits or have a wee swim.
plenty fruit n veg,protien and water.Caffine helps too but dont go overboard.
Enjoy
Jet