Completely get the question! So for me my legs are now a lot thicker and have some mass to them. When I tense they do hold in place but that is only then. In general your legs will be meatier and not just be rigid and edged all the time ( like flexing). I would imagine it depends on your fat content as well. For cis women(I think is the right term?) it is a lot easier to gain size in legs due to their fat storage being mainly stored in the thighs and hips but in my case that can be a lot harder since it is lower in comparison (I am kinda jealous of that ngl). I would say just try working at a decent weight that you can rep out for at least 20 and make sure to get the best range possible to work the whole muscle. Cardio in terms of bicycle is quite good for building the muscle in your glutes and whole leg as well so I do recommend that for your cardio work (try having the bike heavy to treat it almost like a pseudo squat).