A full body workout doesn't have to be long and complicated.
When I was 18 or 19, I had gone to college and started getting fat. I did a simple 20 minute treadmill walk at 3mph. Then went through the 1st line of nautilus machines at the
fitness center. This was done every day - which we know now is probably counter-productive and I'd have gotten better results doing it 2 or 3 days a week.
That means I did 1 set of 10-12 reps of each of the following:
Leg extension
Leg curl
Seated chest press
Butterfly
Tricep pullover machine
Rowing machine
Lat Pulldown macine
Oblique machine
Seated
crunch machine
Some kind of "lean back" thingy which looked like a crunch machine put together backwards which supposedly safely replaced the deadlift.
The results - I went from 260 to 200 in 8 months. My dad told me, "you better quit working out because you need new shirts - your sleeves are getting too tight". This was from a man who's never complimented anyone for any reason - except for very hard work.
Granted I was young, male, and had a natural anabolic advantage that I don't have now...but it did show me that a short full body workout can be effective. In fact, that's what I tried to do 2 years ago when I started over except with only free weights. Being 34 years old with serious health problems - it wasn't the right thing for me to do anymore and I got no where - causing me to end up here at DF to learn about splits, rest, nutrition.