Test yourself the last Sunday in January by participating in either an indoor biathlon or triathlon.

The biathlon is from 7:30 to 10:30 a.m. Sunday, Jan. 29, at the Tomahawk Ridge Community Center, 11902 Lowell.

For the biathlon, participants will use a treadmill for running and a stationary bike for the bike portion. Each lasts 20 minutes.

The triathlon is from 7:30 to 10:30 a.m. Sunday, Jan. 29, at the Matt Ross Community Center, 8101 Marty.

The three events will be 15 minutes apiece, with running on the treadmill, biking on a stationary bike, and swimming in the lap pool at Matt Ross.

There will be competition for both men and women, with various age categories.

There are different heats and prizes.

Cost to participate is $25 for either event. Register in advance.