The Outside TV network covers a lot of outdoor sports, from competitive running to leisurely camping. They sometimes play around with fanciful inventions. Lately, the crew has experimented with practical uses for large helium balloons. For example, could a sufficiently large balloon negate the weight of a full pack? Yes, it can. Just make sure that you don't put too much helium in the balloon or you may lose your backpack.
What about mountain biking? A difficult ride could be more attainable if you have a force pulling against gravity.
What about just jumping up? Balloon-assisted jumping could be especially fun in basketball.
-via Massimo