I was lifting from July through the end of October but I hurt my lower back at work. I just finished physical therapy and am done w/ the meds that were prescribed to me, but I...
If you like the treadmill try walking (3-3.5mph) on an incline-- vary the incline levels every couple minutes. IMO it'd be a great way to get your cardio in.
No back or bicep exercises? That is a very inefficient workout. Try starting strength (search). As others have stated, diet is by far the most important component of the overall effort. Best of...