I’m a long term Sufferfest user. I use the Yoga every day. To your question. Any of the three sports is a skill. The better you are at the each skill the better you will be an overall athlete. I’m going to use swimming as my example. I was swimming quite a bit from December until March. 4 and sometimes 5 days a week. Early on it was with the Master’s group at noon. It’s 100% free style with varying intervals and varying rest. I got more comfortable through the period where I could lead the 1:30 lane but I wasn’t near where I had been. I went deep into my history. When I was leading the 1:25 lane I was swimming 4 days with 1 day all IM Work. That coach we used loved developing all swimming skills. In February of this year I started swimming one IM workout a week. At first my fly was terrible barely making it 25 yards. By the end of February I was swimming 200 IM no problem and guess what, I was comfortably in the 1:25 lane. I still suck at the Fly but there is no doubt that skill along with back and breast have helped me become a better swimmer.
I think developing your top end in cycling is a very useful skill for all of your cycling. I also think it’s really fun. There are no races in the near future it’s as good as time as any to learn something new.