How do you increase strength in Grand Theft Auto 5?

To increase strength in Grand Theft Auto V, you can engage in activities like hand-to-hand combat, participating in fights, or using melee weapons. Additionally, performing specific actions such as lifting weights at the gym or engaging in physical activities like running or swimming will contribute to your strength stat. Regularly using melee attacks in missions or free roam also helps boost this attribute. The strength stat can be checked in the stats menu to monitor your progress.