a. Regular physical activity is essential for maintaining good health.

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b. Additionally, it improves mental well-being by reducing stress and anxiety.

c. First, it not only helps in weight management but boosts our immune system as well.

d. Dear Jane, I was thinking about our conversation on staying fit and wanted to share some thoughts on exercise.

e. Take care.

f. Exercise can also be a fun social activity, whether it's a team sport or a group fitness class.

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