We have the choice of this:

http://www.elliptical-trainer-reviews.com/images/product-images/proform700-big.jpg

this:

http://www.fitness-machines-exercise-equipment.com/treadmill.jpg

this:

http://www.platinumfitness.co.za/bicycle_450.jpg

or this:

http://ecx.images-amazon.com/images/I/41ozrnojT3L._SL500_AA280_.jpg

for people who say swimming, i already do swimming on a team every day. i want to know what else i can do, far as land based exercise, i could do.