B4

Over the past twenty years, going to a gym has become an important part

 BECOME

B5

of many people's lives.

 LIFE

B6

Many people want to change the way they look by losing weight

 PERSON

B7

and making their muscles firmer.

 FIRM

B8

There are gym­goers, however, who exercise to improve their fitness.

 THEY

B9

They have more energy, their health is improved and they feel less stressed.

 LITTLE

B10

Studies have shown / show that regular exercise also has many psychological benefits.

 SHOW

B11

It improves confidence and self­esteem.

 IMPROVE

B12

People also report that when they are fitter, they can think better.        

 WELL