A trainer says when all he has is a pair of dumbbells he uses this six-move workout to build evenly-balanced upper-body muscle

A man performs a lateral raise with dumbbells in a gym. He is standing with a dumbbell in each hand, holding them out to the sides. .

When time or resources are against him, David Lloyd Clubs master trainer Jack Claxton turns to tri-sets.

This strength-building protocol involves performing three complementary exercises back-to-back.