Do full-body movements and use multiple muscle groups. It takes less time and burns more calories.

Examples:
Swiss Ball Push Jackknife
Barbell Deadlift Row Combo
Squat + Press
Single Leg Romanian Deadlift Row Combination
Box Step Up Dumbbell Press
Barbell Deadlift + Push Up
Dumbbell Backward Lunge Curl and Press
Push Up To Side Bridge