Hi there! Sorry to hear that the Hevy app is freezing and crashing on your iPhone running iOS 18.5. I'd love to help get this sorted out for you.

To start, could you tell me a little more about when the app is freezing or crashing? For example:
- Does it happen right when you open the app, or during specific actions?
- Have you noticed if it happens only when connected to Wi-Fi or mobile data?
- Have you tried restarting your iPhone or closing and reopening the app already?

In the meantime, here are some steps that usually help resolve app freezing or crashing on iPhones:

1. Force quit the Hevy app and reopen it:
- On your iPhone, swipe up from the bottom and pause (or double-click the Home button if applicable).
- Find Hevy in the app switcher, then swipe it off the screen to close.
- Open Hevy again and see if it runs smoothly.

2. Restart your device:
Power off your iPhone, wait about 30 seconds, then turn it back on. This clears temporary glitches that may affect apps.

3. Check for app updates:
Go to the App Store, tap your profile icon, and see if there’s an update available for Hevy. Updating may bring fixes for crashes and freezes.

4. Check for iOS updates:
Sometimes, bugs in the operating system can cause app instability. Go to Settings > General > Software Update and ensure you have the latest version installed for iOS 18.5.

5. Reinstall the app:
If the problem persists, delete the Hevy app from your iPhone (tap and hold the icon, then tap Remove App), restart your phone, then reinstall the app from the App Store. This can clear out corrupted app data.

If these initial steps don’t help, let me know what you’ve tried and if there are any error messages. I can then guide you through more advanced troubleshooting or escalate your case if needed.

Are you able to try these steps and tell me what happens?