If you feel ready to take your workout to the next level, check out CrossFit. This regimen is used by all Fire Services, Police Forces and Military Special Forces to name a few.
CrossFit will push you to the limit, and then a little further. Prepare to feel the burn.
Here's an example of a CrossFit workout:
Complete as many rounds in twenty minutes as you can of:
4 Handstand Push-ups
8 2-Pood Kettlebell swings