Weightlifting for just 20 minutes a day could boost memory by 10 percent. Participants in the study (Georgia Institute of Technology) described as 46 healthy young adults tried to remember 90 photos displayed on a computer. Half of the group then did 50 reps of leg extensions, the others just sat in the chair and let the machine do all the work. They returned to the lab two days later to view 180 photos (90 from the prior session and 90 new images). The leg extension group, it turned out, was also able to extend their memory. They were able to recall about 60 percent of the photos from the previous session, while the control group could only remember 50 percent.