Talking about difficulty

Very difficult because the training is thorough and detailed

• tiring

• rigorous

• tricky

Difficult because you need a lot of effort and energy

• backbreaking

• arduous

Hard because you need to give it a lot of time and attention

• demanding

• tricky

• rigorous

So difficult you have to push yourself almost to the point of hurting yourself

• ardous

• punishing

• tricky

Difficult because there are rules that must be obeyed

• strict

• tough

• backbreaking

Difficult and extremely tiring

• tricky

• exhausting

Involves hard pshysical work that makes your body sore

• backbreaking

• grueling

Difficult to deal with and needs careful attention or skill

• strict

• tricky

• rigorous

Extremely tiring and difficult. You need a lot of effort and determination

• grouling

• exhausting
• demanding