Strongest Lego Technic Vehicle - Gym Workout - Making and Testing

What to do if you understand that you need to go to the gym, but you are very reluctant to go there!
Here are a few exercises for the gym that you can do using the Lego Technic.

00:00 MK I - FWD Drive system
01:23 MK II - RWD
02:25 MK III - 4x4
03:00 Let's add some weight...
04:53 Lego Technic Twin Engine Vehicle