I'd stick to the BFL lifting plan. You want to work your larger muscles first, then your smaller. If you can hardly finish biceps and triceps, you are doing it right!
IMO, based on where you are now, BFL is a fine plan. You aren't doing that much more cardio than it calls for, and probably not as intense as the original plan. By the time you finish a challenge, a 12 mile bike race should be just a short jaunt for you!
Mel
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