On Monday I had my first trial go of the blackcurrant tablets from @CurranzHealth.
On a totally non-scientific basis I was super-impressed.
I used the currant tab (90 mins before) alongside caffeine tabs (1hour before) and a beet-it shot (1 hour before)
1. 800m pool PB by 5 seconds. OK I’m not the world’s best swimmer but I’ll take 5 seconds off any PB any day. I think I could have gone faster but I didn’t give it all over the last 50 or so.
2. Segment cycling PB in the same evening over 1km. I normally do this as 2x 1km out and back with a rest of about 5 mins in between to iron out the gradient and any wind factors. However on this particular day I just did the one way run and the wind was from the side and virtually non-existent in any case. I’m supposedly tapering for a race! Never mind. I’m now top of the segment leaderboard with 51 km/h and I think that was the first time I’d done more than 50 km/h in either direction. Full race kit as was the previous PB, tyres a bit low on the pressure if anything and the bike not especially lubed up. I tried the same thing last week and noticed on Monday less of a lactate burn towards the end.
And I was not feeling too well AND I was fatigued from some fairly fast sprints over the weekend. Although not too much to be fair.
Blackcurrants? Taste a whole lot better than beetroot (as I say I used both).
Last Updated on 25 January 2026 by the5krunner
My favourite kit and nutrition
- Injinji – Runners protect your toes. Avoid discomfort and minor injury. Run more. Run faster. I use them.
- Garmin 90-degree charging adapter — A small keyring adapter you can use anywhere. Essential when away. I use one.
- Garmin charging puck — the fastest and most reliable way to top up your Garmin before a session. I use one.
- Ravemen FR300 — Front light that mounts directly under your Garmin or Wahoo head unit. Keeps your bars clean and your beam pointed where it matters. I use one.
- Body Glide – The blue anti-chafe stick that all swimmers and many runners use. I use it.
- Maurten — The race nutrition trusted by elite athletes. Gels and drink mixes engineered to be easy on the stomach. I use them.
- Garmin Varia RTL515 — A radar rear light that alerts you to vehicles approaching from behind. Pairs with your Edge or Wahoo. I use this model.
- Favero Assioma Pro RS2 — The power-meter pedals most serious cyclists choose. Accurate, easy to move between bikes. I use this model.
- Garmin Forerunner 970 — A serious choice for a pro-grade triathlon watch. I use this.
- Polar H10 — My daily driver for accurate, waking HRV readings.
- Wahoo ELEMNT Roam 3 — The bike computer that has the feature Garmin lacks: usability. I use mine on most rides.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
