I published it a little over half an hour ago. It should become available on the Play Store soon, and when it does, you'll be able to find it here
Try Drextee Messenger (https://play.google.com/store/apps/details?id=com.idelan.drexteemessenger ) for SMS, email and Hangouts, has keyboard with error correction technology, word prediction for faster typing, emoji, voice recognition and many other nice features. Best of all it's FREE at the moment.
If you make a mistake when pressing the small keys of the keyboard, you can simply drag your finger on the keyboard to correct the error. No need to press the backspace and re enter the letter or move the cursor.
https://play.google.com/store/apps/details?id=com.hariscelic.androidseye&hl=en
Here are some promo codes as well:
ANLAU71ZV2MGVQ9TW0G97FW K9G291SGP30BT2DNSJ4Y992 SS0TD086YC1V9C38CVHG343 VQWGH9ZENS7JS74WVZFL0A2 EH1S8PAKCGY226531669R0F 751KDN8Y64CB135Q3ALXNGW G1Q9Y9AN7X6S9GMEX9QL7LK FZ50XHXLLSC8LCRC85PXN6C 9WCMRHFTKCSNL0QKGH8A28B BJZSKF4CNW33S3330U51NJN X6C0E63NDFTTCPDQ57VMLUX V3AEV8F7TFNRMK8USZXSQVN LTUREG84NFEM56W5DC1UJ3S 28QEYR8W7RYJSAVP22AYSV2 LGP5WBLSQZF4YVR7QYBM3Z6 E2QN6KDRH6K9RH108XA2S0T NDE59HAWD2ND0SR61X6CLTV QY5DWV19RJXG6ZNZ705Q5PN QGS27YW9KE90C3QXKKG5T9Y
I just found Cinch. You can set it to monitor constantly for a workout or set it to check at intervals throughout the day. It can be linked to Google Fit as well. It will drain your battery if you let it run all day... https://play.google.com/store/apps/details?id=com.ryansteckler.perfectcinch
Not in the google messenger itself but you can sideload a 3rd party keyboard with Wear support like Minuum, they have instructions on their website. Then Wear Messenger which supports that keyboard.