I have to remember to find out if riding too much will hurt me. I'm making sure I get the prescribed miles in at HR level 1, 2, & 3 with the required warm ups and cool downs in level 1 but I find that I'm adding a bunch of miles at varying levels of exertion.
On Monday I rode following the HR rules in my training plan to the letter. You'd be surprised how difficult it is to stay at a certain HR (+ or - 2.5 beats per minute).
Tuesday and today (Thursday) I ran, again following the HR rules. Man is that easy. I can't believe that I'm actually preparing for a marathon length run. I don't want to sound like I know what I'm talking about here, because I don't. But right now I'm just running for 15 minutes at HR level 1. This puts me at a 10 minute / mile pace or 6 mph. Then I run for 15 minutes at level 2. I move at about an 8 1/2 minute pace during that part of the run with 2 30 second sprints into level 3 & 4.
On Tuesday I noticed that I was keeping within the letter of the rules, but not the spirit. Yes, I did the run in level 1 but I really spent all my time at 1.9. Ditto when I was supposed to be in level 2 I ran at 2.9. It's much easier to stay at a certain HR range when running that when biking. I swear if you move back or forward on your seat your HR jumps or falls 5 bpm.
I swam 1,000 meters on Monday and Wednesday. I think I did the whole swim; warm up, rests, intervals, and cool down in a shorter time than I did the LT test last Saturday. Today is my swim assessment (finally). Now I get to see what's wrong with my stroke (everything). I'm sure after the swim tomorrow I'll use muscles I've never used before and I'll be dying.
I love doing something physical for the first time. The learning / improvement curve is so steep that you can't help but have fun doing it. I'm sure I'll be complaining like everyone else when I'm doing 4,000 meters at lunch 3 times / week.