I'm signed up for an indoor triathlon tomorrow. We will be competing to see who can go the farthest, while, really, we're mostly exercising in place.
You see, we will swim laps for 10 minutes in a pool, spin pedals for 15 minutes on stationary bikes, and then gallop 15 minutes on treadmills.
The winner is whoever goes the farthest, measured in miles I think, trusting the electronics on the bikes and treadmills to give you virtual miles, and adding in the actual distance covered in the lap swimming.
But your whole time exercising is limited to 40 minutes, which is why I recommend this to anyone who wants to try triathlon but who is worried that they will simply not be able to complete one of the three legs. Most often it's the swim they're worried about. The beauty of this format is that you are practically guaranteed to finish. So you slow down on the swim - so you stop and stand up in the pool to catch your breath - so what? You're still going to finish in just 10 minutes total time, just like everybody else.
Also - there are no temptations to spend big bucks in this format. Expensive wetsuit? Not allowed! Expensive bicycle? Nope. Use the same stationary bike everyone else does!
And the weather? No worries about thunderstorms or heat!
Triathlons always involve some stress,
The indoor format involves much less.