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Exercising is one of my very favorite hobbies. I practice Muay Thai regularly, and have been involved in testing fitness products for Mashable for years. Let me tell you, investing in your fitness can run up quitethe bill. From gym memberships to apparel to home gym equipment, you're going to end up spending a lot of money if you want to become more passionate about your physical fitness. That is, unless you take advantage of Prime Big Deal Days, which features a lot of fantastic discounts on fitness-related products.

Take a look at my favorite fitness deals from the October Prime Day event below. I think it's a pretty well-rounded collection of products that'll suit beginners and experienced gymgoers alike.

Best water bottle deal

Before you partake in any sort of exercise, you should always make sure you're hydrated first. Drink one or two of these Hydro Flask growlers per day, and you should be golden. This 64oz bottle is $16.24 off during the Prime Day sale and should keep your water nice and cool all day.

Best yoga mat deal

I think that yoga is an excellent introduction to fitness for just about anyone. You don't need much equipment, and the benefits you can take from the activity like improved balance, core strength, and help with muscle pain, are worth the effort. All you really need is a mat, and this one from Gaiam is on sale during Prime Big Deal Days for just $46.99 ($22.99 off).

Best fitness tracker deal

I don't normally wear fitness trackers, but I understand their value. I think if they help you stay accountable to your fitness goals, then it's worth having one. This budget model from Amazfit is basic, but will help you track of health analytics, sleep stats, and more. It's only $39.99 for October Prime Day, saving you $10.

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Best massage gun deal

My Theragun Pro is my pride and joy. I use it just about every day, and it has definitely paid for itself by now. I think that recovery is one of the most important aspects to invest in for fitness enthusiasts, and my favorite way to do that is self-massage. While pricey, the Theragun Pro is one of the highest-quality massage guns you're going to find on the market. Thankfully, it's on sale for $20 off during Amazon's sale, bringing the price down to $279.

Best adjustable dumbbell deal

If you don't have space for a home gym but enjoy lifting, having a pair of adjustable dumbbells is a must. It's like having an entire rack of weights in your home, but in one compact piece of equipment. I use the Bowflex SelectTech 552 dumbbells, but I also really liked this set from Powerblock when I tried them. They're way more affordable, too — just $159.90 during Prime Big Deal Days, $79.10 off.