"Just press start" or "Only one button between you and your workout" or "One button to a better you" (okay, not that one). I'm not any good at this, but I like

"Just press start" or "Only one button between you and your workout" or "One button to a better you" (okay, not that one). I'm not any good at this, but I like the idea behind your app and I understand what you're trying to say. Quaffapint puts the tagline problem well.