I'm interested - I'm not very happy with my current workout routine, it takes too much time.
I would like to exercise at home every morning less than 15 minutes; I don't have any equipment beyond a rowing machine. I mostly exercise for thealth and energy benefits, but wouldn't mind gaining a bit of strength and muscle mass in my normal state I'm a skinny bag of bones).
I'd recommend squats, pushups, and rows. To save time, you'd want to do them in a circuit. The links provided give a progression guideline. I'd say start off with 3 sets of 4, and when that feels comfortable, add a rep to each set, progressing to the next exercise when you can do 3x8. Pushups, rows, and squats all work different muscle groups, so they won't interfere with each other, so you don't need a rest period.
Finish off with 4 minutes doing Tabata intervals on your rowing machine. This entire routine should take you less than the 15 minute requested...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.