Apparently, one of the best activities to improve your chances with Covid is a brisk walk:
www.nature.com/articles/s41366-021-00771-z
Compared to those with a brisk walking pace, the OR of severe COVID-19 for steady/average and slow walkers was 1.13 (0.98, 1.31) and 1.88 (1.53, 2.31), respectively. For COVID-19 mortality, the OR (odds ratio) for same comparisons were 1.44 (1.10, 1.90) and 1.83 (1.26, 2.65), respectively.