One of my "go to" sessions is simple, 1 min 'on' / 1 min 'off' repeated a certain number of times, but the beauty is in the universal way a simple session like this can be used, at any time in training year and with almost any level / fitness of athlete. The key to it is the emphasis of the 'on' and 'off' intervals and the number of reps. It could equally be described as "timed fartlek"…as opposed to a "free form fartlek" where you use things like trees, posts, and other landmarks as the delimeters, but the effect is similar. I'll explain this further with some examples, using running as the sport.
The pre-requisite for this session is having sufficient fitness to be able to consider doing a session beyond just easy running, something that will take a new runner some time to build up to. Once you have, the sky is the limit in using this session.
The first example in using this session is for a runner who is new to any form of interval type training, and are more familiar with just easy paced running. For this runner using their watch to time out 1 min at a "faster" pace, then 1 min at a "slower" pace introduces them to simply running at different speeds. They could do it for a certain number of reps, around a particular course to set a duration for the session, much like a race is a defined length.
The key detail is the "faster" and "slower" pace, which is expressed that way to help the runner develop a feel for their own ability, and pacing during a session. For new runners it is part of experience to know what it feels like to run faster, and to align that with their ability to maintain a pace for duration…this session introduces them to that which is why it is important not to set any specific pace target and let them work it out themselves.
This approach can also be used for a runner returning from a break to get back into interval training in a gradual way rather than aiming for specific targets before their fitness is at that level.
Moving on to a more experienced runner, the session can be used for speed development with high emphasis on the 'on' interval and using the 'off' interval for very easy recovery. In this way, there is a large discrepancy between the 'on' and 'off', and keeping it time limited means you also control how much recovery the runner gets rather than leaving it open-ended, eg, 200m recovery, by contrast, can take minutes if they slowly walk it.
A further variation is to make it a threshold/tempo session where there is only small variation between the 'on' and 'off', so that the emphasis is on the overall duration of session rather than the individual reps. For example, 10 x 1 min on / 1 min off, becomes a 20 min tempo session featuring surges for each 'on' minute, but still maintaining a high pace during the 'off' minute. In that case, they key is not slowing down too much in the 'off' interval…if you execute it will you will find the total distance covered in the 20min will only be slightly less than if you did a 20 min effort.
A beauty of using the session in a tempo style is that the runner can choose the effort / pace depending on how they feel that day, and it's a good way to break up a 20 min effort if you're a little unsure of your capability to do 20 min straight…the 'on' and 'off' allow you to build the effort to achieve a productive session rather than potentially abandoning it if you feel ordinary from the start.
A final example for this session is during a taper, where you can use it to keep some intensity in training without the session being too stressful in the lead-up to an event. In this scenario, the 'on' could be at goal pace, and the 'off' at an easier pace, which helps the runner be in tune with how they want to run in the upcoming race. The duration could be something like 10-20 min total (ie, 5-10 reps), just enough for them to feel a little effort but short enough not to fatigue them.
So the key points of the session are the use of individual feel for the 'on' and 'off' intervals, and how the variance in pace between those intervals can change the nature of session. While I've based this on a 1 min base, you can use all kinds of variations to the length of the 'on' and 'off' intervals - a favourite is 2 min 'on', 1 min 'off', which has been a favourite amongst Kenyans for many years.
This is just one session that I use, where the key point is how you can use and control the 'on' and 'off' intervals to vary the nature of the session depending on the season, athlete ability, how they are feeling on a particular day and more. Being flexible is crucial to getting the most from any session, and choosing a session which allows this - while still being aligned to the training objective - helps piece together a great training program.
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