From my workout today:
I just want to make the point that if you're not recovering, it you're not refueling yourself correctly, if your nervous system is not recovered, you will feel it in your training. You will feel that in the gym. Today I only did two sets of lat pulldowns because I could feel that my nervous system was burned out by this weekend's running and travel. So I just walked and did my steps instead.
I keep it super simple, super minimal. I'm only lifting three days a week, and then I do my cardio sessions (either running or walking). 10-15,000 steps every day and that will keep you lean. That's my approach.
This is a simple way -- a real way -- to build muscle.