No rifle needed for a biathlon-esque workout. I like the fast to slow, slow to fast combo of cardio and strength training. Stop to start, high to low, fast to slow is the way to go to mix it up.
Using the skier, get the heart pumping and then set up in a pistol position to Shoulder Press a landmine barbell and a Single Arm Dumbbell Chest Press. A minimum amount of rest keeps the pace up. Take time to control your breathing, aim and fire up the weight. I'm on a one arm at a time kick for the moment.
No skier - hit the rower, do jumping jacks, jump rope, versa climber...take a lap, whatever - be in motion for a minute. I like the full body exposure be it skier or rower. As for moving weight, with the landmine press I am stabilizing from knee to shoulder pulling the weight down. Keep good form up and down, controlling the weight.
For the Dumbbell Bench Press I throw in a trick I was shown using the knee to efficiently move the weight into and out of the horizontal position. Be efficient and effective in your effort to pump and press, fast to slow, while making it a beautiful day to get in motion!
personal trainer, recovering comedian chatting about muscle from the mean streets of the cul-de-sac