You can share an activity easily by viewing it and enable Public Activity in upper right.
Another thing you can do is generate a workout report for the activity and post that report. To do that look on the left above title and click the small icon that looks like a gauge to generate a report.
If the activity includes a BT (breakthrough) event the gauge will be a BT badge icon instead. It may be bronze, silver, or gold depending on how many changes to your signature occurred. Bronze is one change. Silver is two changes. Gold is all three signature values changed – PP (peak power), HIE (high intensity energy), or TP (threshold power).
Signature values explained: Fitness Signature – Xert (baronbiosys.com)
Had a BT recently? Click that badge icon and you share it here –
Let’s See Some Recent BT’s - General - Xert Community Forum (xertonline.com)