Time to sort my life out

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I’ve just finished maths and science teacher training and over the past year I’ve put on almost 2 stone. Need to be heading back the other way. Have realised i need more to life than working 90+ hours a week and its not good to be 19 stone. Ok i am 6ft 4in so not that bad but would love to get to around 15-16st. Time to start enjoying life, enjoy the nice weather and loose weight. Would love to hear from anyone who has the same idea. BTW for anyone interested I live just outside Bristol and am lucky to live near the countryside. Great for a walk when the weather is nice.