There are a lot of ways that one could go with this. One place to start would be basic calisthenic style fitness. This is all predicated on the idea that you are already doing cardio and ab work.
For instance, three basic movements are pushes, pulls and squating. For pushes you can start with push-ups, pulls could be pull-ups/chin-ups (in an ideal world, if you are not there you can do other variations) and for squating just start with body weight squats.
Start doing sets of them three times a week with ascending numbers of reps per week or session. Throw in some abs.
MON: 3 sets of- 10 Push-ups, 10 body pulls (using TRX system), 20 body weight squats (30,30 and 60)
WED: 3 sets of- 11 Push-ups, 11 body pulls (using TRX system), 22 body weight squats (33,33 and 66)
FRI: 3 sets of- 12 Push-ups, 12 body pulls (using TRX system), 25 body weight squats (36,33 and 75)
MON: 3 sets of- 15 Push-ups, 15 body pulls (using TRX system), 27 body weight squats (45,45 and 60)
Etc
If you get stuck, do a few sessions with the same rep structure before you step up, or hit the protein a little harder after the work out. The goal is to help increase your muscle tone and mobility even if this does not cause you to lose weight. This is also supposing you are doing some cardio along with it.
There are a million other exercises, progression methods, etc that can be done. This type of approach is just one that is not terribly equipment intensive and I am familiar with from the military.
Once you are used to the air squats, if you want a kick in the junk on the last work out day of the week you can always try "Sally Ups." Its pain...with music!
https://www.youtube.com/watch?v=CswK7e_Bep8In the same vein, there is always "Roxanne."
https://www.youtube.com/watch?v=39NVwBpcSKg A decent push-up progression program can be found here:
http://hundredpushups.com/test.htmlYou can ignore all the stuff where it is trying to sell you stuff. Just concentrate on the training method.