Does Cardio "Count" For Strength Training?
Listener Christee asked: "Does using an elliptical machine with incline and resistance count toward strength training? I’d like to skip the squats and lunges, which are hard on my knees, and focus my free weight strength training on my upper body."
To answer this question properly, I need to explain what happens when you strength train with weights.
When the cells in your muscle fibers sense this trauma, they begin to rally the muscle-building troops from your body to repair the tears, and your muscles grow stronger and become more "toned."
For a response like this to occur, the muscle needs to be subjected to amounts of force that are typically only possible to produce for 8-12 repetitions. In contrast, even a "high resistance" elliptical trainer workout involves literally hundreds of repetitions. So trying to "strength train" with cardio is impossible if your goal is muscle gain.
If your goal is simply to make your legs stronger, then a high resistance elliptical trainer, bicycle, incline treadmill, or stairmaster workout can certainly do the trick, but at a much slower rate of progress compared to doing squats, lunges, or deadlifts.
If your knees hurt while doing squats, lunges, or any variations of them, then try this:
Going through less range of motion
Using machines like leg extension and leg curl for 6-8 weeks before progressing to squats and lunges
Ensuring your hamstrings are flexible.