I have recently started incorporating giant sets into my routine with the odd superset. I have cut training time down and increased intensity hugely. So far results seem great, I may alternate between this routine and regular sets over a couple of months. One example:
Barbell curls
Tricep pushdown
Hammer curls
Close grip bench
Reverse (or sometimes preacher) curls
Reverse dips
No rest in between. Max 2 min rest after the lot, start again, do it three times.
For Chest / Back its:
Dips
Pull-ups (or lat pulldown)
Flyes
Seated Rows
Incline Dumbell press
Close grip pull down
No rest in between - rest 1-2 mins afterwards, repeat twice more.
Alternatively do three sets, one after the other, of one muscle group (Dips, Flyes, Incline Dumbell Press) without resting in between, then a 1-2min rest and then the next muscle group.
I have found stamina improving and intensity is superb with these workouts... anyone else giant / super / negative or drop setting as a regular part of their routine? It's one of those things you think you can't do until you actually try it.
Note, I'm not a serious bodybuilder - too 'over the hill' for that lol. I do enjoy my weekly endorphins and testosterone boost though. I generally take lean pure protein suppliments - anything with 75g or more per 100. At my age it's not easy to control the carbs like it used to be