The one-two punch of diet and exercise may be the best for obese seniors who want to be stronger and more fit, finds a study released Wednesday in the New England Journal of Medicine.

Researchers placed 107 men and women who were obese and age 65 and older into one of four groups for a year: one that dieted; one that did cardio, resistance, flexibility and balance exercises three times a week; one that did both; and a control group that neither dieted nor exercised.

More than one million 20 minute sessions of Dakim BrainFitness have been completed by more than thousands of seniors said the company in a statement.

The award-winning program, which has been clinically tested and shown to improve memory has been installed in more than 450 senior living communities nationwide since its introduction in 2006.

“The key to brain exercise for seniors is twofold: rigorously cross-training the brain in multiple cognitive domains and making the activities enjoyable enough to do on the consistent basis that has been shown to achieve results,” said Dan Michel, CEO and Founder of Dakim. “We developed Dakim BrainFitness with those objectives in mind, and the fact that we have just seen our 1 millionth session completed demonstrates that we succeeded in building a program with true staying power for users.”