Instead of doing the same crunches try bicycle crunches or reverse crunches. Try switching up the weights and reps you do. If you constantly do 10 reps at a certain amount try adding more weights and doing 4 to 6 reps. Rotate in between free weights and cables. Run in intervals instead of at the same steady pace. Start off walking for 2 minutes to warm up and ten gradually increase your speed. Get to a "peak point" and slow it back down. For instance minutes 3-8 increase your speed every minute until you reach your "peak point", slow back down and minutes 9-13 do the same thing and keep repeating that pattern.

Another suggestion might be to keep a workout log. The exercise you really like seem to be the pillar or backbone of your routine. If you notice a specific workout recurring to much, let it rest and try something else. The trick is to notice what your doing and get as much variety s possible.

The big problem for alot of people mixing up their routines is lack of knowledge. What works and what doesn't is a concern for people because they don't want to waste their time. The best advice I have to offer here is to get educated, hit the net and research or even hire a personal trainer. The most important thing to remember is just to do something with your current knowledge and skill set and to keep learning and making improvements.

I wish you the best of luck in your success and if you would like more info visit http://theconditioningcoach.blogspot.com/ or http://www.theconditioningcoach.com/ Kyle Combs has been assisting others for years in various fields. His passion is help people get the results they are looking for in life. Best of luck to your success