In reply to John Newbiggin:
> Can anyone recommend from their own experience what works best for them when using a gym along side climbing?
> I'm mainly hoping to get into good cardio condition, as well as improve core strength, so thought I'd join a local gym. I was thinking rowing, free weights, maybe cross trainer. What do you think?
As you can see, everyone on the internet is an expert and offers informed, qualified experience.
Back to your question, what are your objectives? Do you want a gym routine that complements your climbing? What kind of climbing do you want to improve at (bouldering, routes - trad/sport, overhanging/slab), or by climbing do you mean hard hillwalking?
Or is your climbing training going well and you are looking for exercises that will offer some degree of prehabilitation and target complementary muscles? You say you want to improve 'cardio', but there are many ways to do this (and there is no 'discrete' cardio energy system, they all overlap), and what is your end goal? Do you propose to use this cardio for a winter ascent of the Ben or for general health?
As for core training, deadlifting and back squats work your core VERY effectively, as do body levers and planches. Which of these approaches would be most useful again comes back to your climbing goals and current training. If you are doing a lot of overhanging stuff then front/back levers may interfere with your recovery from climbing.
If you are not specific with your question, you'll get incompatible advice from the Internet, and then a fight will break out between each of us who think we are 'right'.
I know this might not be the response you are after but I genuinely HTHs as there are some knowledgeable people on this site.
One more thing - training that leaves you exhausted is not necessarily training that will leave you closer to your training goals.
Post edited at 16:42