Тренировки начались с простой ходьб

Тренировки начались с простой ходьбы, но потом он стал прогрессировать и вскоре смог бегать.

Результаты (английский) 1:

Training began with a simple walk, but then it became progress and soon was able to run.

Результаты (английский) 2:

Training began with a simple walk, but then he began to progress and was soon able to run.

Результаты (английский) 3:

Training began with a simple walk, but then he was slowed down and soon was able to run.