Hi. This ECG looks normal except for fast heart rate. Post covid exercise deconditioning is common which can last for upto two months post recovery. Means you will feel your stamina is less or your pulse rate might increase in an exaggerated way even with minimal physical activity.
You can start exercising in gym gradually and increase the workload as when you feel comfortable. Prefer aerobic dynamic exercise
Also if you are planning to do some high intensity workouts it is better to get an Echo and TMT test to he on safer side.
Next Steps
If you lead a healthy life style, have no other medical issues and no family history of heart disease or sudden death then should be ok
Health Tips
You can check your
Vitamin D and
B12 levels for the shifting pain you have