It is important to consider teachers’ professional development (PD) when they are tasked with teaching Newton’s Law of motion in biomechanics to high school students for the first time. Physical education (PE) teachers regularly use the Teaching Games for Understanding (TGfU) pedagogy to teach physical activity to students. TGfU is a pedagogical model which originated in the 1980s with the main objective of promoting game-based learning in physical activity and sport. However, research involving if the TGfU pedagogy can be used to impart practical and theoretical knowledge to teachers when teaching Newton’s Laws of Motion in biomechanics is limited. The present study provides the outcomes of a PD biomechanics workshop for high school teachers (n = 39) with no prior knowledge of teaching biomechanics. Results from an online questionnaire using Likert scale items depicted the TGfU activities and intensity of agreement/disagreement. Results suggest that teachers intend to use the TGfU pedagogy (mean 4.78, median, 4.26, rank 1), and agreed in the model’s potential (mean 4.62, median 4.09, rank 3).