Mel Robbins discovered the 5 second rule about 7 years ago. It is well before she worked for CNN, gave a TedX talk, in-fact, she discovered this amazing rule at the worst stage of her life.
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If you don’t start doing the things you don’t feel like doing, you will wake up one year from today and be in exactly the same place. Mel Robbins
The book emphasizes on “becoming the person you always wanted to be”. You can get the book from Mel’s website here