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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