Good Morning,
Books are sometimes one of my favorite pastimes. I not only like to write, but of course also read a lot. So I've made it a habit to work through at least one training book every month. Sometimes the dry ham is where the author must have clenched his teeth while writing, but then there are always very nice specimens that follow a storyline. 
One of these books is “Faster with Strength Training” by Max Longrée. Formerly a professional triathlete himself, he creates a wonderful connection between strength training and endurance sports. Like many other books, it covers not just the "how?" So it presents explicit exercise programs, but also the "why?" It explains in detail why strength training is part of endurance sport. Did you know, for example, that maximum strength is decisive for the much-loved endurance, etc ...
Another plus point is that Max describes exactly how you integrate strength training throughout the year and into your daily triathlon training plan. It takes surprisingly little time because you can, for example, integrate plyometric training into your runs. Then it won't be so boring on the lonely winter circuit. Only the battle ropes are quite loud for normal household use, or if you have neighbors. To do this, you should first drag them into the city park, garden or forest. But it's always cool.
Overall, very readable, and it's true that you will get faster through targeted strength training. If anyone illustrates this well, it is Max Longrée
The second book that I would like to present here is "Triathlon Anatomy" by Mark Klion. One of my athletes brought it to my attention and I think it's excellent too. In wonderfully detailed diagrams, numerous
Strength exercises shown and their direct effect on triathlon performance. Which exercises improve, for example, the crawl, the ability to sprint on the bike or the ability to cope with climbs faster while running? The author focuses almost exclusively on exercises without equipment. Very interesting, especially for triathletes without a studio. In addition to the main exercise, a more stringent variant for advanced learners is usually shown. Some of them are too hardcore even for me.
Especially in winter, before you freeze on your bike for two hours outside, you prefer to invest the time in sensible strength training, you get more of that!
wish you a good week!
krelli