During your weight training routine, stretch between sets. This will keep your muscles loose and save you time at the end of your program. Remember to drink every 15 min. to keep your muscles hydrated. And last but not least, all exercises have an expiration date. Given enough time, your muscles will adapt to your routine and will stop responding. Change them every 4 to 6 weeks. Switch to a different exercise for the same muscle group. Think Muscle Confusion.
Now keep pumping it up!