Jack LaLanne’s son says he is ready to carry on the family business … and will take over his father’s role as the company’s official ultra-fit spokesperson.

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TMZ spoke with Jon LaLanne — one of Jack’s three children — who told us, “Though we are saddened by our father’s passing, the overwhelming response from fans and the media has made us all feel he is still with us.”

Jon added, “I plan to carry on the family business. I will be alongside my mother Elaine, my wife Lora, my brother Dan and my sister Yvonne touring the country preaching my father’s common sense approach to a longer and better life.”

Jon is an accomplished businessman himself — running a successful surf board company aptly named “LaLa.”