Post written by Leo Babauta.
I am only summarizing it here for consideration - please read his entire post over at his website here. And while these are more for weight lifting, it can apply to any work out plan if you set your mind to it.
It’s possible to get a super-effective workout in 30 minutes, and only do a few workouts a week, if you maximize your workouts.
1. Limit your workouts to 30 - 40 minutes
2. High-intesity workouts
6. Shake before and after workout
7. Slow lifting
8. Heavier weight
9. One set, to failure
10. Compound Exercises
11. Balance Lifting
12. Pick a cardio exercise you enjoy
13. Mix it up
14. Good form