Stephanie Kanowitz The Washington Post

Trikes for adults aren't new, but they're finding a larger fan base among recreational and more serious cyclists.

High-intensity interval training, requires only a few minutes of (really) hard work to cover all the major muscle groups. HIIT, as it's called, alternates short periods of all-out activity with even briefer breaks. Typically 20 to 30 seconds of work followed by 10 seconds of recovery - spiking metabolism and tricking your body into thinking it rest...

Trikes for adults aren't new, but they're finding a larger fan base among recreational and more serious cyclists.

High-intensity interval training, requires only a few minutes of (really) hard work to cover all the major muscle groups. HIIT, as it's called, alternates short periods of all-out activity with even briefer breaks. Typically 20 to 30 seconds of work followed by 10 seconds of recovery - spiking metabolism and tricking your body into thinking it rest...