No worries - first try to force sync your Partner App activities by doing the following:
1) On your main pacts page, tap Start Activity
2) Tap the Gym pact icon (barbell) and move the toggle to 'Partner Apps'
3) Under the App that you'd like to force sync, tap the blue circular arrow icon
4) You'll receive a confirmation if any new activities have synced from that partner app
For more guidance, here's a how-to video on force syncing: http://youtu.be/tx2ixQ0XLmQ
If your workout still does not show in the app after refreshing the main page, please contact our support team with a screenshot from your partner app verifying that you completed your workout on the day or days they did not sync so we may look into adding them manually.