Sometimes you've only got a 30min window to fit in a workout, including your 5min run to the gym & shower, its not giving you much time but you've convinced yourself its better than not going, which is true.
Try a few multi joint exercises which will work the big muscle groups, it gets you to push your cardio and at least give you a bit of a sweat going.
The exercise to the right is a basic, but effective compound movement , which will work the legs , butt, abs and arms.
1 step forward 2 press 3 arms back 4 step back & repeat.
Resistance does not have to be heavy if your looking for weight loss its about 12-15 repetitions at around 60% of your maximum load.
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