When I have tried weight training and bike training at the same time it made me horrible at both. Too burned out. I will be 51 in a few days and decided to train on the bikes with an ocassional hike here and there. I get enough strength type training mowing and weed eating and running a chain saw etc etc .. I just can’t clank weights and ride at the same time. I figure cardiovascular fitness at this stage is more important plus I enjoy bike riding so much more than weight training like conquering climbing over that hill on my bike or riding a century. Plus I can eat with in reason anything I want since the bikes burn tons of calories.