This article aims to discuss students’ achievement at extensive reading classes. Since extensive reading is usually directed to lead students enjoying in reading, while some others demanded the students to be able to read better after having an extensive reading subject, this research is intended to find out in which part extensive reading give a higher impact on students’ progress; whether it is on reading motivation or reading ability. The research was conducted in the English education section of IAIN Bukittinggi, especially for second-grade students who took the extensive reading subject. The research was run in terms of descriptive research in order to describe the significant impact of extensive reading; whether it was for increasing students’ motivation in reading or more on improving students’ reading ability. The research found that 98 % of students agree that extensive reading increases their motivation to read while 76% claimed that extensive reading improves their reading ability. The finding of this research showed that extensive reading activity works effectively for improving students’ reading motivation as well as their reading ability.