I'm in okay shape, but I'll admit the most amount of burpees I've done in a single session prior to doing this program was around 50. So yeah, I was sore the next day, but nothing I'm not familiar with.
The Military Style definitely taxes the cardiovascular system, while the Navy Seals push the pressing muscles to failure. Eating a diet that fights inflammation helps with muscle soreness (fatty fish/fish oil, dark leafy greens).
The Busy Dad Program has levels of reps so you have something to aim for, so I guess the next hurdle is reaching 150/60 military/navy, but I'm honestly just happy with how quick and dead simple this routine is.
I will say adding regular pullups to the routine is a must though. You can't do that many pushing exercises day after day without incurring some kind of shoulder injury. Pulling exercises supposedly protect against this, and I believe it.
Anyways, I'll be sticking with this for at least 6 months before considering moving onto something else.