What a great workout I had last night. I was chugging along on my trainer watching TV (bored as usual), at a heart rate of about 135BPM... I then got out some 15lb hand weights and did some bicep curls, shrugs, shoulder press, etc., lifting while holding the same biking intensity. I would lift/bike for about 2 min, then just bike 2 min, and repeated this for about 40 minutes. When lifting/biking my heart rate would soar to 165-175 without even much perceived effort. I'm loving this. Anyone else do this?