Dear Izza,
It feels nice to reply you as you are our regular visitor. A person can become active and sharp by reading autobiographies or life-stories of famous people (Seerat e Rasool [SAWW] & Sahabah preferably), talk with friends on different topics, observe everything around very keenly, remember where we put things, sequence of events, what we say to others, what others say to us, good eye-hand coordination, use gestures while speaking, always speaking truth, offering Salah five times and asking help from Allah (SWT).