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Secret Training Stealth Training Mix



Subtle taste and mixes well, but pricey compared with competitors

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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Secret Training's Stealth Training Mix uses very subtle flavours to package a well-rounded nutrition profile. It's not sweet or sticky, it mixes well and the scoop fits into a standard cycling bottle.

Taste is pretty much everything when it comes to energy drinks. If it's not palatable, you won't use it. So it surprised me to find such a mild taste from this watermelon flavour. I initially thought I hadn't used enough powder, which is brilliant if you want to add slightly more carbs to your intake.

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Stealth includes the almost standard 20g of carbohydrates. This means that one bottle per hour combined with a gel and a bar should give you the fuel for longer rides. I never remember to fuel that regularly, so it was good to be able to add more scoops to my water without making the taste unbearable.

Of the 20g, 19 of those are made up of sugar. When compared with Science In Sport's GO Electrolyte powder, it initially doesn't make for the best reading: SIS delivers 36g of carbs with only 6.7g of sugar. Here, though, the sugar is Palatinose (isomaltulose), a specific sugar that Secret Training says releases slower than traditional sugars and carbohydrates. Its reasoning for using Palatinose was to avoid spikes in the athlete's blood sugars.

It might also help your body burn stored fat as energy – read more here – which could be good news for those of us who want to lose a little weight from cycling. 

Secret Training has also included electrolytes to counter fluids lost when sweating. Cramps are never fun and having suffered from them, I've since taken an electrolyte drink with me on every ride. Some can taste quite gritty or too sweet, but the Stealth mix dissolved completely and, as I've said, was rather palatable.

You'd hardly think that the scoop's shape would matter, but a poorly designed one will deposit your powder annoyingly around the bottle's opening. This scoop fits my bottles from Elite, CamelBak and Tacx, with no spilt powder. That keeps the bottle and thus your hands from becoming sticky. It's not the biggest thing, but can become really annoying over time.

> Read more reviews of energy and recovery drinks here

Out on the road, the watermelon flavour was so light it almost tasted of plain water (orange and pineapple are available too). I was very glad of this at the top of climbs where the last thing I wanted was a sickly taste. I also suffered no stomach complaints. Stealth Training Mix also features natural flavourings and sweeteners which, Secret Training says, makes this 'teeth friendly'. Its nice to know it won't erode your teeth. It's also gluten-free and suitable for vegans.

The only issue really is the price: it's very steep. At £22.50 for 600g, it's twice the price of the SIS Go Electrolyte I mentioned earlier. So although Stealth Training Mix made a nice change from my usual citrus or berry flavours, and the powder mixed well with no grittiness, and I had no issues with cramps, it represents pretty poor value against key rivals and that really lets it down.


Subtle taste and mixes well, but pricey compared with competitors

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Make and model: Stealth Training Mix

Size tested: 600g

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

From Secret Training:

"Slow release carbohydrate and hydration drink mix"

Does what it says on the tin.

Tell us some more about the technical aspects of the product?

1 x 600g

Slow release carbohydrates


Developed with Pro Team

Ideal for fat burning

Natural Flavouring

Teeth kind

Rate the product for quality of construction:

I like the idea of a bag instead of a tub, much more compact, and the powder mixes perfectly.

Rate the product for performance:

20g of carbs is ok but leaves you 40g short of the rough guide of what you need per hour.

Rate the product for comfort (if applicable)

No issues with stomach cramps, which is always good.

Rate the product for value:

One of the more 'up market brands', but little to justify the price hike.

Tell us how the product performed overall when used for its designed purpose

I had no issues with cramps or stomach issues. It will supplement training, but don't expect to go for hours on one bottle.

Tell us what you particularly liked about the product

The taste is really subtle.

Tell us what you particularly disliked about the product

The price.

Did you enjoy using the product? Yes

Would you consider buying the product? No

Would you recommend the product to a friend? No

Use this box to explain your score

Gains points for being palatable and mixing well, but the price leaves a bitter aftertaste.

Overall rating: 5/10

About the tester

Age: 22  Height: 177cm  Weight: 64kg

I usually ride: Cannondale Supersix Di2  My best bike is:

I've been riding for: 5-10 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: road racing, time trialling, cyclo-cross, commuting, club rides, general fitness riding, I specialise in the Cafe Ride!

Son of a Marathon runner, Nephew of a National 24hr Champion, the racing genetics have completely passed him by. After joining the staff in 2016 as a reviewer, Liam quickly started writing feature articles and news pieces. After a little time living in Canada, where he spent most of his time eating poutine, Liam returned with the launch of DealClincher, taking over the Editor role at the start of 2018. At the weekend, Liam can be found racing on the road both in the UK and abroad, though he prefers the muddy fields of cyclocross. To date, his biggest race win is to the front of the cafe queue.

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