I haven’t seen the plans, but ignorance has never stopped me from commenting before…
An 8 week plan to increase power at threshold in cycling is most likely going to consist of doing L4 intervals (some variant of 2x20s: hard intervals), and perhaps a short period of L5 (3-8 minute really hard intervals). You would be hard pressed to do more than 2-3 sessions of these a week, so any other cycling workouts would have to be recovery-type rides. As long as you don’t drop those sessions, and manage to be reasonably recovered (and not stiff and sore from the last bike session or other workout), you should be able to do it.
So, let’s see - 2 “quality” workouts a week would move me toward my goal of increased power? Or would 3 be better? This feels like a dumb question, but . . . I’m asking it anyway. OR should it be 2 “quality” workouts and 1 longer aerobic paced ride? Seems like I should keep an easier ride in there, too, for base??? Need to fit in 3 runs and 2 swims somewhere. Oh, then there’s weight training. Argh - is this really the “off season.”
(again, speaking from ignorance of CP’s plans, but I’ve read a lot on power training)
The idea is that doing 2-3 L4 workouts a week, increasing about 5W every other week for 8-10 weeks will add some 20-30W to your threshold power. That’s a substantial amount (a couple of MPH for beginners). It’s easier for beginners, and harder for experienced riders. If you can do them every other day, and progress, go for it. More is not always better, if you aren’t recovered.
Here’s a description of L4 workouts (from http://www.cyclingpeaks.com/levels.html):
“Just below to just above TT effort, taking into account duration, current fitness, environmental conditions, etc. Essentially continuous sensation of moderate or even greater leg effort/fatigue. Continuous conversation difficult at best, due to depth/frequency of breathing. Effort sufficiently high that sustained exercise at this level is mentally very taxing - therefore typically performed in training as multiple ‘repeats’, ‘modules’, or ‘blocks’ of 10-30 min duration. Consecutive days of training at level 4 possible, but such workouts generally only performed when sufficiently rested/recovered from prior training so as to be able to maintain intensity.”
Unless you are doing a ton of squats, skip the weights.