This 20-minute arms & abs workout is the perfect little strength workout for those days you need something quick.

Focusing on the same muscle for 2-3 sets you'll feel the burn as we hit the biceps, triceps and ab. Osteoporosis-friendly ab exercises are also demo'ed.

Day 18 of the 21-Day Fit & Fierce Challenge.

Tools: a couple of moderate dumbbells

2 x 30sec
Hammer curl to press 3

3 x 30sec
Bicycle crunches

2 x 30sec
Crush press to skullcrusher

3 x 30sec
Weighted ab lifts

2 x 30sec
Hanging curls

3 x 30sec
Windmill

2 x 30sec
Tricep kicks

3 x 30sec
Windmill