I’m a marathoner and these 3 running accessories improve my training and make carrying my phone easier — they’re all reduced for Prime Day

SPIbelt Savings Squad Prime Day
(Image credit: Future)

I run almost every day and while I’m always testing new running shoes, headphones and watches to review, there are some accessories that I use constantly because they’ve proved so useful in solving common problems other runners and I have.

Right now, three of my favorite accessories are on sale on Amazon, and I think any regular runner should check out these deals just in case the products can be as useful to you as they are for me.

The three products each solve a different problem I have on the run: carrying my phone, carrying fuel and hydration on long runs, and tracking my heart rate accurately. If any of those issues strike a chord with you, you’re going to benefit from jumping on these deals.

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The problem: carrying my phone during runs

SPIBelt running belt

(Image credit: SPIBelt)

Some people love to leave their phone behind and bask in the freedom of running free from distractions. I’m not one of those people.

I love to listen to podcasts and music during runs, and need to stay in touch with my family just in case I have to rush home — I have two young kids, and you never know what’s going to happen.

So I need my phone with me, and I don’t want to carry it in my hand, because that's just inconvenient, especially when things get sweaty.

The solution: a running belt

a photo of the SPIbelt running belt

(Image credit: Future/Tom's Guide)

I’ve tried a lot of different ways to carry my phone on the run, and the most convenient is a running belt. They’re easier to adjust and use than armband phone holders, and I find they hold my phone more securely than tucking it into the pockets on a set of shorts.

The SPIbelt running belt is the best I’ve tested, and it’s included in the Amazon sale right now. I wear it almost every day for all types of runs, and it does the job of holding my phone without bouncing perfectly.

SPIbelt Running Belt
SPIbelt Running Belt: was $29 now $25 at Amazon

The SPIbelt is a lightweight running belt with one large pocket that expands to take even large smartphones easily. You can adjust the fit quickly and I've had no trouble with my phone bouncing around while wearing this belt. Use the coupon available on Amazon to get 15% off the belt during Prime Day.

The problem: carrying gels and drinks during long runs

SIS Go sports gel packets

(Image credit: Tom's Guide)

I’m almost always marathon training and do a long run most weeks, where I have to carry gels and energy drinks with me, not only to fuel those runs but also to practice my race day nutrition.

I find even the lightest running backpack can be a bit bulky for this purpose, so I prefer to pack everything I need into a pair of high-storage shorts.

The solution: high-storage running shorts

Flipbelt Compression Shorts

(Image credit: Flipbelt)

Traditional running shorts famously don’t have many pockets, but there’s a new trend for high storage potions that have multiple pockets and drop-in pouches to hold all your nutrition essentials.

The Flipbelt Compression Shorts with pockets can hold several gels, your phone, plus a couple of 250ml soft flasks comfortably, in my experience, which is all I need to get through my longest marathon training runs.

Flipbelt Compression Shorts
Flipbelt Compression Shorts: was $68 now $46 at Amazon

These half tights are comfortable and provide a supportive level of compression during long runs, and you can pack the built-in belt with gels, drinks and other essentials. The shorts are reduced by 32% for Prime Day.

The problem: heart rate sensors on watches aren’t 100% accurate

a photo of the Garmin Epix 2

(Image credit: Future/Tom's Guide)

The best running watches all offer built-in optical heart rate sensors and these are now pretty reliable in my experience, especially in warm weather.

However, even the best wrist-based sensor is prone to errors, because it’s not a great place to put a heart rate sensor, since your hand moves around so much during runs.

I find that wrist trackers will sometimes lock onto my running cadence rather than heart rate, and optical sensors also struggle to find my heart during the colder months.

The solution: a chest strap heart rate monitor

Man wearing Polar chest strap heart rate monitor

Chest strap heart rate monitors are the gold standard for accuracy in tracking during exercise. They use electrical signals directly from the heart, and rarely err as a result.

If I’m using heart rate to guide my effort during runs, or using the training analysis on my watch — much of which is based on heart rate during runs — I prefer to rely on a chest strap that links to my watch instead of the built-in sensor.

I’ve used a variety of chest straps over the years and Polar’s H10 sensor is seen as one of the most accurate on the market for a reason. It’s currently reduced by 27% in the Prime Day sales.

Polar H10
Polar H10: was $104 now $76 at Amazon

The Polar H10 chest strap has been around for a long time, which means it often pops up in sales, including right now for Prime Day. It's as accurate a heart rate monitor as you'll find, links easily to any sports watch, and I find if comfortable to wear for runs of any length.

Nick Harris-Fry
Senior Writer

Nick Harris-Fry is an experienced health and fitness journalist, writing professionally since 2012. He spent nine years working on the Coach magazine and website before moving to the fitness team at Tom’s Guide in 2024. Nick is a keen runner and also the founder of YouTube channel The Run Testers, which specialises in reviewing running shoes, watches, headphones and other gear.

Nick ran his first marathon in 2016 and became obsessed with the sport. He now has PBs of 2hr 25min for the marathon and 15min 30sec for 5K. Nick is also a qualified Run Leader in the UK.

Nick is an established expert in the fitness area and along with writing for many publications, including Live Science, Expert Reviews, Wareable, Coach and Get Sweat Go, he has been quoted on The Guardian and The Independent.

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