One of the things that I am trying to reintegrate into my workout routine is some light-duty weightlifting. When I was at COCC (community college), one of the classes I took was a weightlifting class. I didn't like the instructor, but I liked the technique of keeping a weightlifting "chart" of sorts. That's basic stuff to people who lift, but for me, who's always kind of hated lifting, it was a game-changer just to keep track of how I was progressing. I've fallen of the wagon, though, but by posting here, I'm committing to getting back on track. It's not rocket science: you just list down the left side of a piece of paper the exercises you'll do each time, and then under the column for each day you write down what you did. Here's what I'm currently doing for my routine:
Push-Ups
Bicep Curls
Seated Leg Curl
Leg Press
Chest Press
Pec Fly
Chin Up
Rear Deltoid
Sit Ups
Plank
I don't necessarily do them in that order; it depends on which pieces of equipment are free and how I feel. I do try to do all of them each time. Some people do "leg day", "arm day", etc., but I'm not enough of a weightlifter to need that (at least not yet). This is more of a complement to my cardio, which is my focus. When I'm focused, I can get this done in 15-20 minutes, but usually it's closer to half an hour by the time I end up waiting for machines, drinking water, changing, and generally wasting time. Each of them I do 3 times for 10 reps, except for Push-Ups and SitUps where I try to do 10% more than the previous time or until exhaustion (same with Plank, I guess, but for time instead of reps). And I can't do anywhere near 30 chin ups so I use a machine that provides an assist.