The 24-year-old from Spain clinched two World Championship titles, an All England title beside the Olympic crown - all within three years between 2014 to 2016.
But she lost motivation because of injuries post the Rio Games. Last year, she won the Japan Open and European Championship besides reaching the finals at India Open, Malaysia Open and Singapore Open.
However, she suffered a hip injury during the Hong Kong Superseries and missed the Dubai Superseries Finals in December.
"I feel my performance is not 100 per cent but it would be there in the All England. I feel motivated because I want to keep improving my game. I will prepare very well for All England," said the former world no. 1 Marin.
"Last year it was hard because I had injuries after Olympics and my body needed a long break. It is always tough to keep going mentally after you have an injury but I have a good team.
The All England Championships is schedule to be held from March 14 to 18 at Birmingham.
Her mentor and chief coach Fernando Rivas will not travel with her for every tournament from now on and Marin said with her coach not around she needs to be more focused on court.
"I have another coach, who knows what I need. Fernando has a baby so he couldn't come and he can't be there in all tournaments with me. Now I will have to think more about myself and the game," said Marin, who guided Hyderabad Hunters to title triumph in PBL 3 last month.
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