do lazy aerobics count?

i try to work out at least three times a week. i do this great video called "yoga power fusion". i really love it. you do some yoga, tai chi, pilates, and chi gong (i have no clue what that is). well, i try to do these aerobics at 5 am, as that is the only time i feel i can do them. i teach from 8-3 and then have play practice until 5 or 6. by the time i get home, all i want to do is eat and go to sleep. so anyway, back to the 5 am workout. i have been doing really well with it since december. i thought i would get a jump on new years since if it was a new years resolution, i would feel like i would just break it. this way i have fooled my mind into thinking that this is what i am supposed to do. well, monday morning i get up at 5 and head out to start my aerobics. well, i am just so tired, that it is hard to do them. at times i would simply stop and flop on the floor. eventually, i would get up and continue wherever they where in the video. i even fast forwarded some parts, because i knew i did not have the energy to do them. all in all i probable only worked out for 20-25 of the 45 minutes. so, i ask you. is it worth it? is it enough to make the effort and try but not fully complete the workout? yes, it is best to work hard and finish and not give up, but i ask you, is it still beneficial to do a lazy workout?