Fartlek running demands sustained aerobic energy for 30-90 minutes of mixed-intensity intervals. Carbohydrates are your primary fuel source during running, with pre-session intake helping ensure adequate energy availability. Consuming 30-45g of easily digestible carbs 30-90 minutes before training can support your workout readiness. For this reason, we've included Impact Pre-Workout, Origin Pre-Workout Alpha, and THE Pre-Workout in your preferred stack—these convenient pre-session formats are designed to be consumed before training, helping you establish a consistent pre-run routine.

For Fartlek running, we recommend Origin Intra-Workout, Electrolyte Plus Tablets, and THE Electrofuel. These portable formats are designed for easy consumption during activity without interrupting your running rhythm. Whilst shorter sessions under 60 minutes may not require intra-workout fuelling, having these products available establishes good habits for longer efforts and warmer conditions. Carbohydrate-electrolyte solutions contribute to the maintenance of endurance performance during prolonged endurance exercise¹, making these products valuable as your training progresses.

Fartlek training creates the stimulus for progressive adaptation. Protein contributes to the maintenance of muscle mass², making post-session nutrition an important recovery component. We've selected All-In-One Recovery, Plant Protein Superblend, and THE Recovery for your preferred stack. These products are specifically formulated for recovery timing, allowing you to meet your protein needs within the optimal 30-120 minute post-session window that supports adaptation to your training.

Fartlek runners typically need 30-60g carbohydrate per hour during the session. This intake supports glycogen stores and maintains performance during prolonged effort. Sodium requirements average 500-700mg/hour to replace sweat losses in moderate conditions. Scale up in heat or if you're a heavy sweater. Use a combination of products to meet targets comfortably.

Gel formats excel for Fartlek fuelling due to portability and rapid absorption. They're lightweight, pocket-sized, and consumed without chewing—ideal when you're moving at pace. Powder formats suit pre-race preparation when mixing isn't rushed. Your production stack includes both: convenient gels for race-day and versatile powders for pre-race loading. Choose based on timing needs.

Training-day nutrition is only part of the bigger picture. How you fuel before and after Fartlek running makes a huge difference to your training and recovery. For everyday support, explore our Protein Guide to find the right protein for your goals, and try our Goal Selector to build a supplement routine tailored to you.

¹ Carbohydrate-electrolyte solutions contribute to the maintenance of endurance performance during prolonged endurance exercise.

² Protein contributes to the maintenance of muscle mass.