Naik = ke atas

What about "Saya tidak mau naik atas"?

This is very confusing ..if you go down it is turun ke bawah .turun being GO but if you go up it naik ke atas ...naik being GO ... why would they do this to themselves why could we just say ...saya mua pergi naik ..or ..saya mua pergi bawah

For some context, you could just say "saya tidak mau naik"