Over the past several years an engineering physics (mechanics) course has been completely restructured. Prior to the restructuring, the course had a traditional structure, consisting of a separate lecture (3 hours three times per week), laboratory (3 hours once a week) and recitation (1.5 hours once a week). Beginning in 2009, the traditional structure was discarded in favor of a single, blended class meeting 2.5 hours three times per week. Moreover, the new class was designed to operate as an active learning course (i.e. with very little lecture) by making use of several active learning methods including peer instruction (aka think-pair-share) and interactive peer laboratories. The implementation of the active learning methods was done in phases over several years and each phase was assessed using the Force Concept Inventory (FCI) assessment test, administered on the first and last days of class. Results from the FCI test, collected over a six-year period, show that the overall gain in performance has tripled as a result of the combined effects of the changes. The results also show that both active learning methods (peer instruction and interactive laboratories), which were phased in at different times, improved the student's conceptual gain.To support the restructured active learning course, the author developed an active learning textbook that consists of nearly a thousand peer instruction questions and over thirty interactive laboratories, many of which are multi-part. This paper focuses on the development and implementation of the interactive laboratories. It covers the educational benefits of the interactive laboratories and describes how they are incorporated into the class. The paper summarizes all of the interactive laboratories that have been developed thus far. It also presents the complete details for a single, representative interactive lab, to illustrate how the interactive labs are performed. Lastly, the paper presents the FCI data that show the conceptual gains obtained by the interactive labs.