tempo run
If you don't enjoy track workouts, do fartlek or tempo runs on roads, trails, or grass.
My marathon training includes long Sunday runs, short sprints, and fartleks.
Fartlek running involves adding short bursts of speed to your regular run.
Many athletes use fartlek training at some point in their programs, often as an introduction to more rigorous interval training.

SMART Vocabulary: related words and phrases

Exercising & training
active recovery
aerial yoga
aerobic
aerobic exercise
aerobicize
gym rat
health spa
heavy bag
HIIT
hyperextension
jogger
pump ironidiom
rope climbing
rowing machine
run on the spotphrase
Russian twist
shoulder press
slimmer
step aerobics
weightlifting