Endurance Spray is a homeopathic blend designed around exercise related fatigue and recovery. The ingredients include arnica, gelsemium, arsenicum album, kali phos and sarcolactic acid, which are commonly used in homeopathic sports and exhaustion formulas.
Because it is a spray, Endurance Spray is mainly about convenience during training, racing or physically demanding days. The key thing to know before buying is that this is a homeopathic product, so you are choosing it for that style of support rather than for measurable amounts of nutrients such as electrolytes, caffeine or amino acids.