Hi. Lately I’ve been running into an annoying problem of trying to do a challenging cardio workout but the endurance of my muscles fails before my cardio feels challenged. For example, if I am running, my legs feel tired before I feel my heartrate has been raised significantly, I do a lot of martial arts and do a lot of rounds on the heavy bag but I feel my legs and arms get fatigued faster than my heartrate and breathing. I’ve tried bouts of steady state training, as well as various intervals including HIIT. I think I’ve been blessed with good recovery when it comes to cardio, but is there something I’m missing here? Should I be working on muscle endurance? Or do I just need to find a different type of workout that I’ve never experienced before? Any insights are welcome!
All of answers are thought-provoking. I agree with Brian that because of your concerns, asking your doctor for a complete physical, including a lab panel may be a good idea. In addition to the comments suggesting adequate dietary complex carbohydrate intake is essential for adequate repacking of muscle glycogen, which provides the substrate essential for not only glucose metabolism, but for fatty acid metabolism, as well.
Also be sure to include at least one day/week for rest and recovery. Also be sure that stay adequately hydrated before, during and after your workouts.