| Monday | 5:15–6:15 AM, 9:30–10:30 AM, 6–9:30 PM |
| Tuesday | 5:15–6:15 AM, 3:30–4:30 PM, 7–9 PM |
| Wednesday | 5:15–6:15 AM, 9:30–10:30 AM, 7:15–9:30 PM |
| Thursday | 5:15–6:15 AM, 9:30–10:30 AM, 4–9 PM |
| Friday | 5:30–6:30 AM |
| Saturday | 6:30–8:30 AM |
| Sunday | 7–10 AM |
Hard Knox Fitness is an independent strength studio in Oswego, IL. The studio is known for its community, hardcore vibe.
Data last verified: 2026-03-13
Own this studio? Email jess.park@sweatlocal.net to update your listing