What I Did:1000 calorie workout...really?

I'm always skeptical when it comes to "workouts by calories" like how do you know you're really burning that much? Do you weight yourself in calories before and after? I dunno. Anyhow they do have a calorie burner that shows potention of 500/600-1000ish calories depending on all the applicable factors I guess (age, sex, effort, weight, male, female etc) so at least that's more legit.
So I had time today, and am 1 workout short this week (like many weeks past) but I'm going to a bachelorette tonight with lots of yummy food so I thought today would be a good day to try an extra long workout.
Warm up & Workout in the video below :) enjoy.

Total Time: 1 hour 28 min..told you it was extra long
HR: after the cardio it was at 170-180, after weights it was closer to 140ish
Sweat'o'Metre: I'm dry now, mostly...but pretty sweaty after the cardio section
Burn'o'Metre: yep, lots of creative exercises...the last hamstring one (leg raise and curl...you'll know it when you try it) oh gosh I was twitching after almost gave myself a charlie horse.

I'm on the ground...so glad it's over. I hate long workouts...