Still been gymming, not been posting much.

I've it an interesting snag. I'm really battling to maintain the high pulse rates at gym now. My legs get SORE!

I am speculating that as my cardio fitness improves, I need to do more and more work to get my pulse up to the same rate as I did before - and am hitting the limits of my muscles now, instead of cardio limits.

I guess there's nothing for it but to grit my teeth and carry on - or is it worth lowering the heart rate targets somewhat?