A good way to train upper body and make it fun and also get a cardio session in as well as strength and strict gymnastics.
10 Barbell bench press @60-70% of your 1RM (this should get hard and you may have to drop reps, don't go below 8 reps)
10 cal row
3 strict chest to ring pull ups @ weighted vest (use as much weight as you can for 3 reps throughout the 10 sets)
10 cal ski
10 KB swings @32/24kg
10 GHD sit ups