Both LISS and HIIT are important but there are a few guidelines you need to have in place to get the benefits. Some have already been mentioned by other posters.
One of the main benefits of LISS is a kind of cardiac hypertrophy. For that to occur these are best practices:
1. Stay within aerobic HR zone.
120-150bpm, or calculate it using the MAFF method.
2. Minimum duration of 30 minutes per session. More is better.
3. Minimum of 3 sessions per week. More is better.
4. Minimum of 5 weeks. This depends on how much your aerobic system sucks right now. You can extend this to 8-12 weeks.
5. You don't have to run. Any activity that keeps you within the optimal Heartrate works. Shadow boxing, light circuit trg.
6. Bonus: For best results avoid HIIT and maximal strength training during your aerobic block. Re-introduce both after.
HIIT and LISS type work have slightly opposing adaptations. The strength work isn't that big of a deal to do alongside, but again there's opposing forces at work that have to do with MTor. I don't fully understand this part, but other posters here have explained it well.
Sources:
Joel Jamieson's Ultimate MMA Conditioning, Tactical Barbell 2, and Phil Maffetone's "Maff Method".
One of the main benefits of LISS is a kind of cardiac hypertrophy. For that to occur these are best practices:
1. Stay within aerobic HR zone.
120-150bpm, or calculate it using the MAFF method.
2. Minimum duration of 30 minutes per session. More is better.
3. Minimum of 3 sessions per week. More is better.
4. Minimum of 5 weeks. This depends on how much your aerobic system sucks right now. You can extend this to 8-12 weeks.
5. You don't have to run. Any activity that keeps you within the optimal Heartrate works. Shadow boxing, light circuit trg.
6. Bonus: For best results avoid HIIT and maximal strength training during your aerobic block. Re-introduce both after.
HIIT and LISS type work have slightly opposing adaptations. The strength work isn't that big of a deal to do alongside, but again there's opposing forces at work that have to do with MTor. I don't fully understand this part, but other posters here have explained it well.
Sources:
Joel Jamieson's Ultimate MMA Conditioning, Tactical Barbell 2, and Phil Maffetone's "Maff Method".