I have been working out for just about a month now. I go 5 days a week. I noticed a huge change in me when I adjusted my work out (haven't noticed in the mirror). I start my work out with 15 min on the treadmill at 3.5 on a incline of 7. I get my rate up to 155-163-they I hit the weights. I do 3 reps of 12 and only stop long enough in to walk to the next machine. I go back in forth until I have done 3 reps on each. Then I move to the next 2 machines. I noticed by not taking a break of 30 seconds or so, my heart rate stayed up and I was sweating. Before I was doing one machine and resting in between for about 30 second. This has mad a huge difference in the way I feel. After the weights, I hit the treadmill for 15-20 minutes on a 3.5 on a 7.5 incline and finish my workout. My husband told me if your not a bit sore, your not pushing enough. Today I am sore. I think I am understanding now.
Mix it up and have fun.