Is most of your exercise from cycling only? Because completely apart from matters of weight loss, I think it could be a good idea to diversify, if so - I certainly find as I'm getting older that while just being generally fit used to be enough to keep everything going, now I need to use specific bits to keep those bits in use, and not have problems just from, e.g. waving 2kg weights around... And given all the physio I've done for my back and all the indoor and outdoor cycling I do, it's still surprising how much I can get my heart rate up in a couple of minutes, given the right exercises. Weighted squats and weighted reverse lunges are good for that, and then five minutes of core strength stuff (generally known as 'leg-waving' in this household) makes a whole load of other things work better too. I mean, my goal there isn't to have met a threshold or standard, my goal is to do things that make my daily life better, really.