In response to a tweet from the research firm Institute for Health Metrics and Evaluation that classified racism and discrimination as a public health issue, Glassman, who is also the executive director of CrossFit, published bit.ly/3f2yNb2 on Saturday, "It's FLOYD-19".
The tweet related to the police murder of an unarmed black man, George Floyd, in the US state of Minneapolis on May 25 and was seen as insensitive.
"We recently discussed a new deal, however, in light of recent events, we made the decision to end our partnership with CrossFit HQ," said the Reebok report.
In a statement on twitter, Glassman said bit.ly/2MDBzaj on Sunday, "I, CrossFit HQ and the CrossFit community will not support racism. I made a mistake with the words I chose yesterday. My heart is deeply saddened by the pain it caused. It was a mistake, not racist, but a mistake. "
CrossFit did not immediately respond to a request for comment on Reebok's action. Adidas did not respond to a request from Reuters on Sunday night for comment.
Reporting by Aishwarya Nair in Bengaluru; Editing by Arun Koyyur