Prolonged physical effort is inextricably linked to depletion of energy, and the loss of valuable nutrients, which in turn can be a real obstacle in achieving the desired result. You may find isotonic drinks very helpful.
Olimp Nutrition Iso Plus Isotonic Energy Drink Powder Orange L-Carnitine 1505g
OLIMP NUTRITION ISO PLUS ISOTONIC SPORT DRINK + L-CARNITINE POWDER HYDRATION