Exercises like deadlifts, squats, RDLs, and lunging patterns effectively train all major lower body muscle groups.

“besides a deadlift and a squat RDL so various stiff legged deadlift or good morning RDL is the same category of movement that trains your entire back uh specifically your spinal erector musculature which is insanely important for healthy aging and then it trains your glutes and it trains your hamstrings and it trains your Sartorius and parts of your adductors and it actually trains your calves too holy crap that's one that's one exercise you integrate some kind of lunging pattern into that or some kind of squatting pattern be it a hack squat leg press barbell squat you name it and all of a sudden you've run out of muscle to train in your lower body”