Bulgarian bag
Power-bags can be used for variety of exercises, like lunges, crunches, squats, and pulls.
With a powerbag, the centre of gravity is always shifting.
I started with a 10 minute powerbag workout.

SMART Vocabulary: related words and phrases

Exercising & training
active recovery
aerial yoga
aerobic
aerobic exercise
aerobicize
gym bunny
gym rat
health spa
heavy bag
HIIT
jogger
pump ironidiom
rope climbing
rowing machine
run on the spotphrase
Russian twist
shoulder press
slimmer
step aerobics
weightlifting