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Princess Kate<\/a><\/strong> is back in the gym and resuming all her favorite activities as she continues to recover from her bout with cancer \u2013 and hubby Prince William<\/strong><\/a> is right by her side as he takes the opportunity to whip himself into tip-top shape as well, a source exclusively tells Life & Style<\/em>.\u00a0<\/span><\/p>\n \u201cKate is so relieved to finally have enough energy to start being more active again, she\u2019s always been very sporty so having to take such a long break from working out was so tough for her,\u201d the insider says.\u00a0<\/span><\/p>\n Since announcing the end of the chemotherapy treatment in September, Kate, 42, has been attending royal events<\/a> and making appearances along with the rest of the family. She revealed she had been diagnosed with an unspecified cancer near the end of March, which required an extended period of treatment and recovery.\u00a0<\/span><\/p>\n During that time, the source says, \u201cShe lost a lot of muscle tone, which really bothered her.\u201d However, as the princess had been active her whole life, playing field hockey and tennis, the real loss was that, \u201cmore than anything, she missed the mental health benefits of working up a good sweat.\u201d\u00a0<\/span><\/p>\n \u201cShe adores running and is back at it. She\u2019s weightlifting again, doing some spin classes and yoga. It\u2019s not at the level she was before, she\u2019s being smart and starting slow, but it\u2019s still more than a lot of people do.\u201d\u00a0<\/span><\/p>\n Luckily for the princess, her heir-apparent husband is also keen on fitness, having been a swimmer and water polo player while at university. \u201cWilliam is joining her for some of her workouts,\u201d the palace insider confirms. \u201cIt\u2019s something they really enjoy doing together, they treat their workout sessions like a date. They\u2019re both quite competitive and push each other in the gym.\u201d<\/span><\/p>\n More than just working on herself, Kate has also dedicated her time to helping others overcome struggles similar to her chemo course. A second source previously told Life & Style<\/em><\/a> the Princess of Wales has \u201cpublicly vowed to help others through their journeys,\u201d and \u201cis following through.\u201d\u00a0<\/span><\/p>\n \u201cHer work has only just begun. She wants to do more. Kate really is determined to turn her difficult experience into something that benefits others,\u201d the source said.<\/span><\/p>\n Another silver lining of Kate\u2019s health crisis was the strengthening of her relationship with her father-in-law, King Charles<\/strong>, who is also battling cancer. As Life & Style<\/em> had reported<\/a>, their simultaneous treatments had brought them closer together in an unexpected way.<\/span><\/p>\n With the terrible episode behind them, the couple are focused on the future \u2013 ensuring they stick around to raise their three children and eventually become kind and queen.\u00a0<\/span><\/p>\n \u201cThey\u2019ve set out goals for next year to get into the best shape of their lives together, it\u2019s something they\u2019re looking forward to and have a whole plan with a trainer set up and that includes their diets, lots of protein so they can build muscle.\u201d\u00a0<\/span><\/p>\n