I am 45, 5’9” 145lbs, run about 65 mpw on 6 days per week during marathon training. I train for 2 marathons a year, PR isn’t great at 3:05.
When I’m out of season, I want to reduce the pounding because I’ve developed a lot of nagging stuff lately. So that means not hitting the trails 6 days per week year around any more. I’m not in season right now so I'm experimenting with cycling for about 45 minutes, then running for about 45 minutes, to replace the usual 10 mile training runs I did. I do this 4x per week. The other 3 days is swimming and pool running.
I’m wondering if cycling before running leads to adaptations for running. In other words, instead of pounding out 10 mile runs 4x/week, would a cycle/run approach simulate a 10 mile run, even though it’s really only 5 miles of running, preceded by a 45 minute bike. I'm only planning to do this to stay in shape and save my knees, hips, and other old man parts prior to jumping back into the 16 week marathon training blocks that I do twice per year. Thanks all.