The areas circled in green. This is a back view of a person. I think one part of what I'm intending to say is the inner glutes.

Working on the latissimus dorsi muscles (the muscles next to your rib cage) is difficult, especially for us girls. You'll have to do a lot of pulling toward and pulling over motions to target that area. One good exercise you can do is to secure resistance bands to something sturdy, stand about 3 to 5 feet away from where you've secured the bands and pull the bands towards your chest. You should do about 3 sets of 15 repititions. You'll start feeling the lactic acid (the burning feeling in your muscles) build up in your arms, and shoulders as well. To work on the old trouble spot for many of us, the old gluteus maximus. You'll want to do a lot of lunging and squatting motions to get a good work out for that area. A good alternative exercise is to get on all fours. While keeping your leg at a 90 degree angle at the knees, extend it back then up as far as you can. Make sure you flex your butt as you bring it back down. You'll want to keep your head level and your back straight so you don't injure your spine. If you have a bad back, you probably don't want to try this exercise. One other alternative is to walk up and down any stairs in your home. It's a good overall workout for your legs and you'll also get some good cardio at the same time. Whenever I can't make it to the gym, I'll walk then run the stairs in my house for about 30 minutes. Good luck!

after i started jogging 30 minutes a day, those spots were as good as gone within a month. cardio is the best way to tighten your body.