[Mary] did not know that going outside was the best thing she could have done, and she did not know that, when she began to walk quickly or even run along paths and down the avenue she was stirring her slow blood and making herself stronger by fighting with the wind which rushed at her face and roared and held her back as if it were some giant she could not see. But the big breaths of rough fresh air blown over the heather filled her lungs with something which was good for her whole thin body and whipped some red color into her cheeks and brightened her dull eyes when she did not know anything about it.