Go, Go Gadget
Turn heads while cruising down the Esplanade on this bicycle/elliptical hybrid, which works the whole body while going easy on the knees and joints.
Starting at $1,799, elliptigo.com.
Reduce impact stress on the ankles and hips with this moon-shoe-esque footwear.
Starting at $199, kangoojumps.com.
This stepper/scooter combo offers a seriously fun workout for adults and kids alike.
Starting at $169, zike.net.