Growing up as a dancer, we had a saying that if you felt like you only had 30 percent of your energy to give during class, you should give 100 percent of that 30 percent. Freeing yourself of that all-or-nothing mentality gives yourself permission to work out a little differently, while maintaining your commitment to doing it at all.
Check in with yourself and listen to your body. If you're bored of your routine, change your scenery, add some variety to your workouts, or try something totally new. But if switching things up doesn't help, challenge yourself to keep going with 100 percent of whatever you have to give.