This is the 18107th most frequent Russian word.
ходьба
Walking.
In this sentence, 'ходьба' represents a general form of walking as a beneficial physical activity.
Ходьба по пляжу укрепляет здоровье.
Walking on the beach improves health.
Here, 'ходьба' is used to refer to a specific type of walking, which is a regulated sport.
Её любимое увлечение — это спортивная ходьба.
Her favorite hobby is speed walking.
In this context, 'ходьба' refers to a daily activity of walking practiced as part of a routine.