i use my "rest times" in between sets to do my stretching and mobility exercises! They are so important to do, yet almost always neglected! i KNOW i wont do the exercises at the end of my workout, because i find them so boring
Dont take this the wrong way, but perhaps you arent working hard enough, and thats why you are bored? If you are truly pushing yourself, then you will CRAVE the rest time!
Also, you could try doing cardio finishers in between your sets.....jumping jacks for a minuts, or mountain climbers, or jump rope, etc, to keep your heart rate up...
OR maybe you need a new strength routine?
I always get excited and fired up when im doing some new program. Have you heard of the New Rules of Lifting for Woman? Has comlete programs to keep you occupied for 6 months or more
There is also the Womans Health Big Book of Exercises, which you can get for like 15 bucks at barnes and noble, or cheaper on amazon. Not ONLY does it have like 700 (literally) strength training exercises, but it also teaches you how to put together your own programs, as well as gives you like 10-15 full on programs (8 weeks or more) plus another 20 or so "quickie" strength routines...
Or you can google "Full body fat loss strength routines"
or "full body workouts"
or Body part split routines for fat loss"
or Body Weight fat loss routines
or whatever, and come up with all sorts of free routines on the internet
Stay consistent with your strength training, but change it up often (every 4 weeks or so, give or take), and you will reap the benefits!
Also, step away from the weight machines, and piick up some free weights!
For a fun change go to your local elementary school and do bodyweight strength training on the equipment! Dips off of steps, monkey bars, using the swings for rear foot elevated lunges, and to put your feet in for planks, etc, inclined pushups on benches, step ups on stairs. Scramble up the slide for cardio in between sets...the possibilities are limitless