can we use flat/apartment staircases, climb 18th floor, and repeat 4 times a day, to substitute for leg press, leg lunges, and calve raises?

i think i want to save cost from going to gym on leg day because i can do this at my flat home.

can elaborate? why we must use weight? climbing exercise also stimulate growth and can tear the muscle tissues also, right?

What are your goal?

for me is strength. toned look is a bonus though.

Your body adapt and changes.
Doing cardio make you more efficient at using oxygen, in short stamina.
Weight training best for growth cause every time you lift and got stronger, you are telling your body you need bigger muscle for that extra weight.
Both can stimulate muscle but different type of fibers. Try google Muscle Fibers and types.

as amedion pointed out, climbing stairs helps very little in building strength, it helps more on stamina.

have u seen strong ppl being associated with their ability to climb stairs?

carry those big mineral bottles (4 gallons full ) and do squats, lunges, etc....

dun have to run up and down the stairs.... ur not aiming for to work on ur cardio with those workout....

Climbing stairs only helps in endurance. How much weight does your leg carries while climbing the staircase? Only your bodyweight. For squat, the amount can go up to 3 times the bodyweight.

It's still cardio. It still helps. It's not all about weights.

Apparently TS's target is for strength for legs.

calisthenics people dont need weights. but still have very toned body.

Well you will still get a significant increase in strength with calisthenics alone, so go ahead whatever you are going to do with your staircase.

Upper body muscle are much smaller than the legs and glutes muscle. It also the reason why most people have lesser bench press numbers compared to their deadlift and squat.

And do check what kind of exercises that those calisthenics practitioner done to achieve their body. Muscle up is the MOST basic exercise for them and what can you do by climbing stairs? One legged hop?

Dude, it all depends on your goal.

If you want to build strength. Just work on your weakness. Weak bicep? Fap all day long. Remember to switch side.

If you want build muscle. Pick up the weight, eat, sleep, repeat and add weight. Easy as that.

If you want to use body weight exercise (calisthenics) to build muscle and toned body. It's possible too but need a lot of time than hitting the gym. You gotta spend few months to master all the basics so you can modify your workout to increase resistance for growth.