MWF
Start out with 10 minutes on the treadmill...not very fast, usually 4 -4.5 mph...In my mind, this gets my heart rate up and read for the rest of the workout.
Mondays, I focus on exercises with my arms/chest. We don't have a real "bench" but we have free weights. I do several exercises with the small dumbells. I use the 8lb ones. I cannot do the same number of reps on the 10 lbs ones and my arms start to fatigue and I don't execute the exercise properly. I do 3 sets of 12 reps of each exercise. I also use this inclined bench machine, row-boat machine, and bicep machine. Again 3 sets of 12.
Then I go back to the treadmill for the remainder of the hour. ( I have to use the whole hour)
Wednesday, I focus on my abs. I do the situps on the big ball thing. 3 sets of 25. I start with the 1/2 situp and then go all the way up. Next I do this exericise with the ball where you "clamp" it with your legs while laying on your back and try to bring the ball to your chest.
Then I use the treadmill to the remainder.
Friday, I work on legs. I do the hip adduction/abduction, then there is this machine where you lay on you back and push off against this metal wall looking thing. 3 sets of 12 of each kind.
Then I use the eliptical as hard as I can for the remainder. I try to keep the strides per minute over 175 at a medium level of resistance. My legs are like jello for about 20 minutes afterward.
After I graduate in May, I am thinking of adding 20 min of cardio between the days or something to make my workouts more effective.
Well looking at your routine it is no surprise you haven't made any gains.
First off, drop the machines. The machines lock your body in a fixed range of motion, use no stabilizer muscles, and won't build any functional strength.
Second, I don't see any work being done on your back. The back and the legs contain the most musculature in the body, and should be the primary targets of your training.
Last, I know there are myths about high reps/less weight being a way of "toning" or what not, but that's all bullshit, point blank, strength builds muscle. If you pump away at light weights you will never gain any muscular body weight. Fat loss and getting ripped is determined by your diet.
If you want to see any significant results in your training you need to train the proven basic free weight exercises through progressive resistance.
I can't stress it enough this program here:
http://startingstrength.wikia.com/wiki/FAQ#Three_Flavors_of_Starting_Strength (the first one)
is perfect for those of you who want to start out effectively, or for those of you who haven't seen any significant results. Whether you want to lose weight, or bulk up, it will completely transform your body, and build a solid foundation.
Hard to believe you can do so only 3 times a week, at only an hour a session, with only 3 exercises per session, but trust me, it works. If in doubt, read through the FAQ:
http://startingstrength.wikia.com/wiki/FAQ#Is_This_Program_Right_For_You.3F