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The weight part is purely calories in vs. calories out - lifting weights alone won’t cause additional weight gain. A lot of the initial strength gains are neurological rather than an increase in muscular size. That said, transitioning to a greater percentage of calories coming from protein sources will aid recovery from the extra work.
As for specific guides, find someone who can teach you to squat properly and then keep doing that. Actual programming matters less but TGR’s starting points aren’t a bad place to begin.
I’m a complete novice when it comes to gym/weight work, but I have the opportunity to use a gym on a Saturday morning for a couple of hours each week and hope it can help me on the bike.
Is there a good resource for showing me where to start? I’m keen to focus on core and legs, while not adding much weight if that’s possible?
Any guidance much appreciated