It is possible to have your ass handed to you in the form of a 5-minute workout.
There is a new extremely high degree of sore that I recently became familiar with.
Kettlebells are way heavier than they look.
The 39 year old me dislikes pull-ups just as much as the 8 year old me.
Jumping rope is harder than I remember.
Lifting weights is not as scary as you would think.
It is possible to be completely petrified and completely elated about the same thing all within an hour.
Even if I almost cried three times after the workouts (not sure what that's about) and can hardly walk down the stairs (and walking in general has become somewhat of a challenge), it's worth it to be reminded of the power that comes from doing something that scares the shit out of you, pushes you to a place you have never been, and gets you to the other side of your excuses -- makes you think of how many other excuses you can get to the other side of. Imagine, all that from a little protein powder and kettlebell swings.