INTRODUCTION: The COVID-19 pandemic has brought a relatively significant impact on the world. Malaysia implemented a countrywide social isolation strategy to flatten the epidemic curve. As limits on movement and social interaction have come into force, more individuals appear less physically active. OBJECTIVE: To determine the perceived barriers to physical activity among Malaysian young adults during the Covid-19 Pandemic. METHODS AND MATERIALS: Total 217 participants included with age group from 18-40 years old voluntarily participated in this study. Participants were excluded if they were non-Malaysian and had any psychological problems and physical impairment that hindered physical activity. Barrier to Being Active quiz (BBAQ) questionnaire was circulated through various social media platforms from January 2021 to May 2021. Categorical data were presented using simple and absolute frequency on the distribution of sociodemographic profiles and BBAQ responses. Pearson Chi-square with 95% confidence level, p<0.05 was used as the significant level to analyze the association between gender and barriers. RESULTS: The barrier reported by the participants was “lack of willpower” 136 (62.7%), followed by “lack of energy” 117(53.9%), “lack of resource” 113(52.1%), “Lack of time,” 109(50.2%), “social influence” 100(46.1%), “lack of skill” 48(22.1%) and “fear of injury” 40(18.4%). There was no significant relationship between gender and Barrier to Physical Activity among Malaysian young adults. CONCLUSION: The “lack of energy,” “lack of willpower,” and “lack of resource” were the most perceived barriers to physical activity among Malaysian young adults during COVID19 lockdown and there was no significant association between physical activity barriers and the gender.