We know physical activity is highly beneficial and necessary for our bodies to function at their optimal levels. Sometimes, though, strange workout symptoms leave us wondering if our bodies know that. From beet-red cheeks to shaking, aching muscles, our bodies tend to freak out a bit when pushed to their limits. No need to worry, though. In most cases, the weird internal and external reactions we experience during exercise are completely normal!

But it鈥檚 important to identify when something鈥檚 just a result of hard work and when something may need medical attention. Here, with the help of some Aaptiv trainers, we break down some of the most common weird workout symptoms you may feel and why they may occur.

Woman exercising outdoors

1. You sweat like crazy even during a light workout. No need to worry. 鈥淥ur core body temperature rises when we exercise and sweating is our way of adapting so we don鈥檛 overheat,鈥 says Aaptiv trainer Jennifer Giamo. And everyone鈥檚 different, so don鈥檛 be concerned (or embarrassed!) if you run through two towels per workout and your BFF sports a light glisten. 鈥淚t really depends on the number of sweat glands you have and how active they are,鈥 says Giamo. 鈥淲omen actually tend to have more than men, but men鈥檚 are more active.鈥

Your body will also get better at cooling itself as you exercise more. So, more workouts may mean less sweat in the long run.

2. Your face stays red for hours after workouts. You鈥檙e probably just hot. 鈥淓xercise dilates blood vessels and a hard workout builds heat, sending oxygenated blood to the skin鈥檚 surface, which causes redness,鈥 says Giamo. If you have fair or sensitive skin, you鈥檒l likely feel and see the effects of this a bit longer than your more olive-skinned friends. This may improve with increased physical fitness, but it鈥檚 totally normal if not. If you experienced rashes or hives, however, see a doctor or allergist. This may indicate something different brewing beneath the surface, or potentially a rare exercise or sweat allergy.

woman stretching at gym

3. You feel fine after your workouts but can barely move two days later. Introducing the dreaded DOMS, or delayed onset muscle soreness. 鈥淲hen we exercise, we create tiny micro tears in the muscles along with inflammation, which causes this discomfort,鈥 says Giamo. 鈥淭he body can take 24 to 72 hours to repair, so you may feel sore for a few days post-workout.鈥

If you regularly experience intense soreness for more than 72 hours, you should incorporate an active rest day the day following a particularly challenging run or lift. 鈥淒o some steady-state cardio, such as running or biking, for 30 minutes to get everything moving and still working,鈥 says Aaptiv trainer Ben Green. 鈥淚 guarantee you鈥檒l feel less sore come day two.鈥

Also, add yoga and stretching workouts in between high intensity or heavy lifting days. This will give your body and mind a break, as well as stretch out sore muscles, which can help prevent future pain.

4. Exercise makes you have to run for the bathroom. If you鈥檝e ever had to rush into an open stall mid-cardio, you鈥檙e probably either cursing the fitness gods or just wondering what鈥檚 up. 鈥淭his is common, especially among runners,鈥 says Giamo. 鈥淭he pound on your body gets the intestines moving (AKA your intestinal motility) and shakes up the bowels.鈥

You may also be dehydrated. 鈥淚f the body doesn鈥檛 have enough fluids, the only option is to eliminate,鈥 says Giamo. 鈥淢ovements that put pressure on the bladder, such as twisting, pulling or lifting, can also leave you needing to go.鈥 This phenomenon is more, uh, regular than you may think. Here are some more suggestions for how to minimize bathroom breaks during your workouts.

5. Your muscles shake like crazy when you鈥檙e lifting weights. There are a few reasons your arms or legs might shake during strength training. 鈥淒ehydration can cause this,鈥 says Giamo. 鈥淭he connective tissue in our bodies need fluid to work properly. When we鈥檙e not properly hydrated, this can also affect our electrolyte balance, which can impact muscle contractions.鈥 Try drinking a bit more throughout the day before and after your workouts and see if the shaking subsides.

If not, look at your form. 鈥淵ou always want to make sure the base of support is stable when lifting weights,鈥 says Green. 鈥淎nd that means keeping your form and posture in check.鈥 Use the mirrors in your gym to make sure you鈥檙e using the right form when lifting.

6. You feel like you鈥檙e going to throw up during workouts. We know exercise gets our bodies moving 鈥 externally and internally 鈥 and that includes our stomachs. 鈥淚f you feel nauseated during a workout, first of all, ask yourself if you鈥檙e actually going to throw up or if you just feel like throwing up,鈥 says Green. 鈥淚f you just feel a little queasy, try slowing down or pulling back just a little bit to see if that helps settle everything down.鈥 If you continue to consistently feel ill when working out, here are some other suggestions for alleviating nausea during exercise.

What weird but normal workout symptoms do you experience? Share them with us at @BritandCo and @Aaptiv.

(Photos via Getty)