Five evidence-based daily habits that improve mental fitness and cognitive resilience (essentially what most experts in the field 

 If you were actually looking for five evidence-based daily habits that improve mental fitness and cognitive resilience (essentially what most experts in the field recommend), here they are, distilled from neuroscience and positive-psychology research:

1. Morning movement (10–30 minutes of exercise)
   Aerobic exercise increases BDNF (brain-derived neurotrophic factor), improves mood, and sharpens focus.
2. Deliberate silence/meditation/mindfulness (5–20 minutes)
   Reduces amygdala reactivity, lowers cortisol, and strengthens prefrontal cortex control.
3. Intentional learning (reading, language app, instrument, etc.)
   Builds cognitive reserve and keeps neuroplasticity high.
4. Gratitude or positive reflection practice
   Rewires the brain toward positive bias (literally grows gray matter in the prefrontal cortex).
5. Quality sleep hygiene (consistent bedtime, no screens 60–90 min before bed)
   Sleep is when the brain clears toxins, consolidates memory, and resets emotional circuits.

If you did have a specific Harold Robbins-related source or quote in mind (or if it was a different author entirely), feel free to clarify and I’ll track it down!