So you say that you don't have enough time to workout? I doubt it.  One of my favorite ways to get a great workout in with a shorter amount of time is with complexes.  With a complex, you combine multiple exercises into one larger movement.  An example would be a squat and overhead press.  Here is an example of a great workout that shouldn't take you more than 20 to 30 minutes to complete. 

Front Squat and Overhead press  3-5 sets x 8-12 reps  45sec rest between sets

Romanian Deadlift and Row  3-5 sets x 8-12 reps 45 sec rest between sets

Stability Ball or ab wheel rollouts 2-3 sets x 10 reps   30 sec rest between sets

A barbell or dumbbell can be used for the complexes.  Combining multi joint movements like this allows you to stimulate a maximal amount of muscles throughout your entire body in a shorter amount of time, and also proves to be a very fatiguing and effective workout.   If you think that you don't have time to get an effective workout in, think again.   You don't have to spend hours training to get a good workout in.