rigorous, very difficult because the training is thorough and detailed, gruelling, difficult because you need a lot of effort and energy, ardous, hard because you need to give it a lot of time and attention, demanding, Difficult and extremely tiring, backbreaking, involves hard physical work that makes your body sore, exhausting, extremely tiring and difficult - you need a lot of effort and determination, tricky, difficult to deal with and needs careful attention or skill, tough, difficult to deal with or do - you need to be physically and emotionally strong, strict, difficult because there are rules that must be obeyed, punishing , so difficult you have to push yourself almost to the point of hurting yourself.

Talking about difficulty

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