I think this might be true for most of us. I was in the best shape of my life right when I got married. I worked out every other day for like and hour and a half. I lifted weights, did cardio, cut out all fast food, and ate really healthy. Why? Because I wanted to look the best I could for my husband (Wade and I called it the honeymoon bod). Well after I got married I haven't really stopped working out I just haven't had the same intensity with it. I haven't gone off the deep end with eating bad food I just don't mind hitting the desserts or grabbing a Big Mac every now and then.
Right after I moved to Charlotte I found my workout buddy Kelly. Although at the time we thought we were awesome with our 40 minute cardios and our 500 calorie burns we were sorely mistaken. We have since upped our workouts with some heavy weightlifting and some intense cardio and my entire body hurts.
When I look back on this whole workout history I wonder why it took so long for me to get serious again. I always wanted to be toned and have a healthy heart and body and I still wanted to look great to my husband. But there was this whole season that I just went through the motions, but didn't take any risks or endure any pain. I figured I was good to just maintain and I wanted to get by with giving as little effort as possible.
I see how this happens with us spiritually as well. I can look back at so many times in my life where I was pursuing God with every ounce of my being and then others where it felt like I was mainly just going through the motions. It doesn't take much for us to lose the focus or take our eyes away from the the goal. Sometimes I think we just give it a tiny bit of effort just so we can strike it off our list or so we can tell ourselves we are good little Christians. But the truth is if you aren't giving it your all you are still a slacker. It takes more than just having this feeling of maintaining your relationship with Christ. It takes upping the intensity and pushing past the pain. If we get to a season where it feels like we are just gliding along or just going through the motions then we need to evaluate how we are connecting with our Lord and then do something to make it a little more intense.