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STILL IN MOTION
Because slowing down isn’t in the plan.
THURSDAY DEEP DIVE: THE STRENGTH MOVE
Sunday’s issue introduced the Loaded Farmer Walk with Nasal Breathing as a Zone 2 hybrid. Today we provide three dedicated cardiovascular formats and the specific interval protocol most supported by research for improving VO2 max in adults over 60.
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FORMAT 1: ZONE 2 WALKING
The most accessible Zone 2 format. Effort level: you can hold a conversation in full sentences, breathing is elevated but not labored, and the effort could be sustained for 60 minutes without significant fatigue.
The protocol:
Target: 30 to 45 minutes at consistent Zone 2 effort, 3 to 4 sessions per week
Nasal breathing test: if you cannot breathe exclusively through the nose at your current pace, slow down — that is Zone 2 for you right now
Heart rate target: calculate your estimated maximum as 208 minus (0.7 times your age). Zone 2 is 60 to 70 percent of that number. For a 65-year-old: max ≈ 163 bpm, Zone 2 ≈ 98 to 114 bpm.
Vary terrain when possible — gentle hills increase cardiac demand without requiring faster pace, which is ideal for Zone 2 specificity
Add a weighted vest (Issue #29) if flat-ground walking cannot elevate heart rate into Zone 2
FORMAT 2: ZONE 2 CYCLING
The most controllable Zone 2 environment. Resistance can be adjusted instantly and there is no impact load, making it the best Zone 2 option for people managing knee, hip, or ankle discomfort.
The protocol:
Set resistance so that maintaining 70 to 90 RPM cadence produces Zone 2 heart rate
If heart rate climbs above Zone 2 before 30 minutes: reduce resistance
If heart rate cannot reach Zone 2 at comfortable cadence: add resistance or increase cadence
Target: 30 to 60 minutes per session
Nasal breathing rule applies: if the nose cannot keep up, intensity is too high
FORMAT 3: THE 4X4 INTERVAL PROTOCOL FOR VO2 MAX
The most evidence-supported high-intensity protocol for improving VO2 max in adults over 60. Developed and extensively studied at the Norwegian University of Science and Technology, it produces the largest VO2 max improvements of any tested protocol in older adults.
Structure:
10-minute warm-up at Zone 2 effort on any cardiovascular modality
4 minutes at 85 to 95 percent of maximum heart rate — very hard; breathing through the mouth; could not speak more than a few words
3 minutes of active recovery at Zone 2 — keep moving, do not fully stop
Repeat 4 times total (4 work intervals, 3 recovery periods)
10-minute cool-down at Zone 2
Perform once per week; maximum twice per week with at least 48 hours between sessions
Total session time: approximately 50 minutes. This is the 20 percent high-intensity work in the 80/20 model. One session per week of this protocol, combined with three to four Zone 2 sessions, produces cardiovascular adaptation that moderate-intensity training at the same weekly volume cannot match.
Important: if you have any cardiovascular history, discuss high-intensity interval training with your physician before beginning. Start with 2 intervals and build to 4 over several weeks.
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COMING UP
Saturday closes out Issue #36 with the full cardiovascular monitoring toolkit, zone calculations, and the apps that make zone-based training consistently trackable.
Still moving forward,
— The SIM60 Team
simsixty.com · Educational content only. Not medical advice.
