In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: She otherwise reported that she is quite active , rides horses , and does show jumping without any limitations in her physical activity .
### Output Text:
She otherwise reported that she is quite active , rides horses , and does show jumping without any limitations in her physical activity . 