The goal of this study is to learn how the number of weekly exercise sessions affects improvements in fitness in healthy university aged students. The main question it aims to answer is how training frequency affects improvements in fitness. Participants will complete a pre-testing sessions to assess fitness level and sprint performance. Following this participants are assigned to one of four groups. A group that exercises 2 days a week, a group that trains 3 days a week, a group that trains 4 days a week, or a no-exercise control group. Participants in this group will not complete any training and allow the researchers to compare the exercise groups to a group that didn't train. Each participant will train for 4 weeks. During each training session participants will complete 4-6 30 second all-out sprints with 4 minutes of rest between each. Participants will complete the same tests they did during the pre-testing session following the 4 weeks of training to see how frequency affects improvements.

Inclusion Criteria:

• Recreationally active: exercising at least 2-3 days per week and not currently involved in, or had been involved in a systematic training program for at least 3 months prior to data collection.
• Safe to become physically active based on the Canadian Society for Exercise Physiology - Get Active Questionnaire.

Exclusion Criteria:

• Smoking
• Consuming supplements known to affect metabolism (e.g., creatine, carnitine, nitric oxide, brain chain amino acids).
• Failure to meet inclusion criteria

Data will be made available to other researchers upon reasonable request.

All pre- and post-testing is completed by researchers not involved in training, and thus are blinded to which group participants are assigned to. This prevents any potential bias when researchers are completing post-testing sessions.