Our expert says:
Difficult to know. You might wish to look at your training and restructure it so that you have a bigger percentage of your time allocated to the weight lifting.
You also need to look at what you're doing in those weight lifting sessions. Perhaps you need to work out a plan that will gradually develop that ability to lift heavier. The fact that your peformance is not improving is a sign that the training could be adjusted to good effect. This means you might need to look at increasing the weights, reducing the sets and spending a few weeks getting stronger. You might be lifting too light or too often. So my advice is to look at the training and modify it. I can't be specific since I don't know what you're doing, other than the balance between weights and cardio.
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