The University of Cambridge Sports Centre is open at the following times:

Monday: 06:30 - 22:00
Tuesday: 06:30 - 22:00
Wednesday: 06:30 - 22:00
Thursday: 06:30 - 22:00
Friday: 06:30 - 22:00
Saturday: 08:00 - 20:00
Sunday: 08:00 - 20:00

Easter Opening Hours 

Good Friday - 8am - 4pm
Easter Saturday - 8am - 8pm (Normal opening hours) 
Easter Sunday - Closed
Easter Monday - 8am - 4pm