Exercise or Over-Exercise?

During this covid pandemic when more people are working from home, with travelling time saved, I see more people in the park, exercising and cycling πŸš΄β€β™€οΈ

From what I have learnt in Nutritional Immunology and Exercise Science, exercising and over-exercising can be different though.

Regular exercise can help in our weight management, release stress, prevent chronic diseases, as well as can enhance our muscle πŸ’ͺ, bone and joint health. However over-exercise can cause rapid production of free radicals in our body. The oxidation can cause stress to our body. This can result in poor functioning of our immune system instead πŸ™