If you time it somewhat good while sprinting forward, you can switch from W to S and sprint backwards.
I've fallen off the edge in Nether a lot of times because of it.
MCPE-96484
Sprinting backwards
Resolved
Duplicate
0
Keccy Deccy
(Unassigned)
Unconfirmed
Windows
Windows 10
1.16.20
Retrieved
Thank you for your report!
We're actually already tracking this issue at MCPE-23502, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki