Keep it simple, stupid.
Unless you’ve been lifting weights for years in Livonia, Michigan, I recommend doing a full body routine that you can do two or three times a week. You want a routine that has at least one exercise for your quads (front of your legs), butt and hamstrings (back of your legs), your push muscles, your pull muscles, and your core. Yes, this means you can develop a full body routine that uses only four or five exercises. Hows THAT for efficient?
Quads – squats, lunges, one legged squats, box jumps.Butt and Hamstrings – hip raises, deadlifts, straight leg deadlifts, good mornings, step ups.Push (chest, shoulders, and triceps) – overhead press, bench press, incline dumbbell press, push ups, dips.Pull (back, biceps, and forearms) – chin ups, pull ups, inverse body weight rows, dumbbell rows.Core (abs and lower back) – planks, side planks, exercise ball crunches, mountain climbers, jumping knee tucks, hanging leg raises.
Pick one exercise from each category above for a workout, and you’ll work almost every single muscle in your body. These are just a few examples for what you can do, but you really don’t need to make things more complicated than this.
Add some variety – If you do the same routine, three days a week, for months and months both you and your muscles will get bored. If you do bench presses on Monday, go with shoulder presses on Wednesday and dips on Friday. Squats on Monday? Try lunges on Wednesday and box jumps on Friday. Pick a different exercise each time and your muscles will stay excited (and so will you).
Lastly, your muscles don’t get built in the gym, they get built when you’re resting. Give your muscles 48-72 hours to recover between workouts. A Monday-Wednesday-Friday workout works well to ensure enough time to recover.