[header] How to prevent boredom in your fitness routine [title] Add weight or repetitions. [step] If you're starting to get bored with your strength-training routine, it may be that your fitness level has increased. As a result, the exercises are no longer challenging for you. 
[substeps] Keep in mind that exercise releases endorphins that make you feel good and make exercise rewarding. If you're no longer working your muscles to the same level, those endorphins aren't being released and you'll no longer enjoy your fitness routine.