A gym session playbook

The mental tax of training with T1D isn't any single decision. It's making the same five decisions every single session. The fix is a playbook: figure out your routine once, run it on repeat, adjust when the data says to.

Here's a structure to build yours on. The specific numbers and dose strategies inside it belong to you and your care team; this is the scaffolding.

Before

Check the trend, not just the number. A flat 120 and a 120 dropping fast are different situations. CGM arrows matter more before exercise than almost any other time.

Know what insulin is on board. Exercise within a couple of hours of a meal bolus behaves differently than fasted training, because active insulin plus muscle uptake stack. Many athletes learn their sessions go smoother at certain distances from meals. Yours is a pattern worth finding.

Know today's workout type. As covered in the cardio versus strength guide, steady aerobic work tends to pull glucose down while high-intensity work can push it up. Deciding "today is a drop day" or "today is a spike day" before you start changes what you pack and what you watch for.

Pack the kit. Fast carbs that survive a gym bag (glucose tabs, gummies, juice box), your meter or phone, and for longer sessions, real fuel. The kit lives in the bag permanently, so forgetting isn't possible.

Tell someone, sometimes. Training partners don't need a lecture, only one sentence: "If I'm acting off, make me drink this." Lifting alone in a garage at 6 a.m. is exactly when that sentence matters.

During

Glance at the CGM between sets or intervals. Not obsessively. Once every 15 to 20 minutes catches most trouble early, and catching a drop at 100 beats treating one at 60.

Respect the weird feeling. Exercise masks low symptoms brilliantly: shaky, sweaty, and tired describes both hypoglycemia and a good workout. When in doubt, check. When checking isn't possible, treat.

Pausing is a strategy, not a failure. A five-minute break with some carbs mid-session costs you almost nothing. Pushing through a real low costs you the rest of the day.

After

Feed the recovery. Post-workout food isn't only for gains; it's part of glucose stability. How to handle insulin around recovery meals on training days is a high-value question for your care team.

Set the overnight alarms. After a big session, make sure CGM low alerts are on and audible. This is the single cheapest insurance in this whole playbook.

Log the weird ones. When a session goes sideways, one line in your notes app: what you did, what you ate, what happened. Three or four entries in, patterns appear. Bring them to your next appointment and your care team can turn patterns into strategy. The appointment prep builder has gym lows covered if you want the questions drafted for you.

The point

None of this makes training with T1D effortless. It makes it repeatable, and repeatable is what lets you think about your program instead of your pancreas.

If the goal behind your sessions is building muscle, the muscle-building guide covers the part this playbook doesn't: eating for growth, bulking and cutting, and recovery on training days. The science companion explains what insulin actually does for muscle, and what it doesn't.