Is your workout routine in a slump? To keep challenging your body, it’s important to tweak your regimen every three months or each season.

By aligning these changes to seasonal changes, you can also start the right prep for the next season’s sports, such as training for skiing in the fall and hiking in the spring. To begin, grab a calendar and chart out your key dates and activities.

Not all the changes to your program have to be dramatic, according to the American Council on Exercise. Challenging yourself can be as simple as changing your strength-training equipment from free weights to resistance bands or to bodyweight-only exercises like push-ups, wall sits and crunches.

If you’ve been exercising solo, one effective change is to build in a social component. Ask a friend to join you for workouts or sign up for an online workout class. You’ll have more fun and be more accountable when others are involved.

Finally, another way to shake up a routine is to add in flexibility and balance work. These are every bit as valuable as cardio and strength training, just in different ways.