old dirty brake fluid
If you haven't flushed your brake system in the last 4 years it's time to do so.
- Bleed the brake system
-Bleed the clutch system
old transmission oil
If your transmission oil is older than 4 years, change it with a fresh one.
Manual Transmission only obviously
leaking master cylinder
A leaking master cylinder can cause your clutch to be hard.
Inspect it for leaks, and if it leaks, replace it.
damaged pedal bracket
Make sure all screws are properly screwed on the bracket and also make sure it's not half way broken.
If so, replace it.