massaging chair

We finish our time in the gym with a massage on the massaging chair.

A 'massaging chair' is a one that gives you a back massage while you sit in it. Notice the following:

1. There is a massaging chair in the lounge at the gym.
   
2. Sitting in the massaging chair for 30 minutes every day really helps my back.
   

do weights

When you're in the gym, do you do weights?

In this case 'do weights' is the same as lift weights.  When you lift weights you raise a heavy object many times to increase your strength. Notice the following:

1. I never have the patience to do weights.
   
2. He does weight five times a week.
   

blow up

We play a game where you have to blow up the other cyclists.

If you 'blow something up' you make it explode. Notice the following:

1. They are going to blow up that old building by the river.
   
2. The car blew up after the accident.
   

goal in mind

Do you have a certain reason or a goal in mind for exercising?

To have a 'goal in mind' is to have an idea of what you want to achieve. Notice the following:

1. Before you make a fitness plan you have to have a goal in mind.
   
2. Did you have a goal in mind when you started this whole thing.
   

shed pounds

I have to shed those extra pounds I put on when I was in Australia.

'Shed pounds' is an informal way to say lose weight or to get rid of new extra weight. Notice the following:

1. It's hard to shed pounds if you keep eating terrible food.
   
2. She worked hard to shed some pounds after she had her baby.