Eric Johnson continues to work on his fitness while his pregnant fianceé Jessica Simpson counts down the days until she gives birth to their first child.

Jess' sexy man hit the hiking trails with his dog for an intense workout. Looks pretty therapeutic to us!

Speaking of Johnson's lady, Simpson recently opened up about her pregnancy cravings. The 31-year-old songstress tells Extra:

    "I had a buttered Pop Tart this morning. I'm eating a lot of stuff that I ate in my childhood. Kraft Mac n' Cheese, Pop Tarts, Cap'n Crunch. Everything's filled with sugar."

Yikes! The Fashion Star mentor adds that she's "definitely eating a lot of Tums. I have the reflux and acid going on."

No wonder Eric is anxious to hit the trails!