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 ISO Plus L-carnitine Isotonic Energy Drink, Carbohydrate and Electrolytes
Olimp Iso Plus Isotonic Powder Lemon L-Carnitine L-Glutamine 1505g Energy
Olimp Iso Plus Isotonic Sports Drink Powder Orange L-Carnitine 1505g
Olimp Iso Plus Isotonic with L-carnitine powder, tropical, 1505 g