The air is getting brisk and the sunlight is waning, but don't go burrowing into your warm house just yet. Instead, try these tweaks to your go-to routine that'll keep you pumped -- even without bathing suit season motivation.

To fill you in on how to spice up your workouts, we talked to Santa Barbara, Calif.-based fitness trainer Scott Crawford, founder of SOMA Get Fit. He says it's super important to give your go-to workout routine an overhaul at the start of a new season.

"Much like the repetitiveness of a factory job, exercise can become a little dull," he says. "Your body gets bored after going through the same old workout day-in and day-out." Here's how to mix up your go-to routine so you stay happy, healthy, and in the best shape of your life.

Crawford explains that aside from the tediousness of doing the same routine year-round, there are two big reasons to mix up your go-to exercise routine:

No. 1: The Law of Adaptability

While you may have found an exercise routine that gives you results, after a few months, you may start to stagnate at the same weight -- even if you stick to your diet, says Crawford. It's due to the Law of Adaptability, he says.

"If you always chest press 10 lbs for 10 reps, the act of doing this movement will become easier and easier," he says. "Because your body becomes essentially more 'efficient' at doing the movement for a specific amount of reps, you'll burn fewer calories," which means less progress. In order to continue getting sleeker and stronger, you'll have to constantly add variety to your workouts, which forces your body to continuously adapt.

No. 2: Repetitive injury cycle

"As we exercise, we create 'wear patterns' on joints, cartilage, and connective tissues," says Crawford. If you do the same exact move over and over again, it literally wears out that specific area and its respective joints and tendons. Crawford compares this to the wear patterns you'd see on your car tires. "If you drive the same route every day and hit the same bumps, in time you will see your tires wearing away," he says. "And the same thing will happen with the new set of tires. Unfortunately we can't replace our joints so easily." The solution? Change things up. See Crawford's suggestions on how to revamp your workout routine next.

An at-home dance or workout DVD.

We get it: Life gets hectic, and the last thing you can squeeze into your schedule is an hour at the gym. Fortunately, there are plenty of at-home workout DVDs you can use at your convenience. You can even get one of the many gaming systems that provide exercises, like Wii Fit. Plus, in our tech-driven era, there are a million ways to find activities that you'll enjoy -- all from the comfort of your own living room. You can even search exercise routines and Zumba moves on YouTube and Facebook.

A gym class, like dance or kickboxing.

Once you've evaluated what you like to do, whether it's dance, aerobics, or cycling, Crawford says that by attending a group fitness class, "you will be exposed to new routines, which will force your body to adapt and burn more calories." Bonus: It's a great way to meet new people and start forming a workout buddy system. Having accountability -- whether it's gym friends or an exercise class teacher -- will help motivate you to go to class and stick to your regimen.

Yoga.

When you're dancing, your heart rate is up, and depending on the type of dance, you're likely jumping, which puts a lot of stress on muscles and bones. While this is a good, bone-building kind of stress, adding yoga to your routine is a great way to slow your body down and stretch tight muscles. "Yoga is also a great opportunity to work on your breathing, which can help you bring more balance to your body," says Crawford. Here are a few tips to get you started:

• Try every form of yoga that is offered, from Vinyasa to Hatha. This will help you find the yoga style that's right for you.
• Consider one-on-one yoga rather than a group class. That kind of individual attention can help you perfect your technique and form -- especially great when you're first starting out.
• Take a Pilates or gyrotonics class if you're just not into yoga. Crawford says these forms of exercise are similar to yoga, but often resonate a bit more with those who can't find a style of yoga they like.