Who we are

Core Confidence Life, formally known as Life Through Strength is a coaching and educational service that is dedicated to the personal development and advancement of highly motivated, growth minded and independent thinking individuals. We seek to bring people to a higher state of consciousness and lower stress, so they can actualize the potential of their mind, body, and spirit.

Founded in New York City in 2014 by Dennis R Sumlin, a certified Life Coach and teacher, Core Confidence Life provides Skills, knowledge, and resources to make each day in life as fulfilling as you desire. With The CCL Podcast and our courses on Mindfulness and confidence building, healthy relationships and sexuality, and communicating to the public, you will gain a deeper understanding of yourself and potencial, create mutually benificial connections with others, and face everyday challenges with inner calm and clear mindedness.


Core Confidence Life is a holistic minded, sex positive, non tradissionalist space. We believe that we are spirits having a human experience, as such, we seek to help you to fully take charge of your mind, body and spirit. Everything we do in the outer world starts with our inner world, and Core Confidence Life’s mission is to help you navigate your inner core so you can share your dynamic energy with others.

Who we work with

Dennis R Sumlin teaching a class at CCNY

We work with individual clients as well as conduct in person and online classes. We also work with other schools and education centers to bring our expertise to their students.

Some of our individual clients have been public office candidates, fortune 100 employees, working class immigrants, and public school teachers.

Educational institutions such as The Door (New York), International Christian University, and The City College of New York have been some of our clients as well.

How to contact

If you have any questions, we would love to hear from you. Choose general business/questions from the form and reach out to us!