For any Himalayan Trek Ideal BMI for a trekker should be 18.5 to 24.9.
To keep a check of this please calculate BMI here
Below given Safety checks should be done to get prepared for any Himalayan Trek :
Cardio-vascular Endurance : Cardiovascular endurance is defined as the ability of lungs and heart to transmit oxygen to the body muscles. All Himalayan treks are basically ascending descending the slopes and for this trekkers should be having a good cardiovascular endurance. Anyone planning for a Himalayan trek can attain this capacity by doing any cardio exercise like running , swimming , cycling etc.
Muscle Flexibility : While trekking in Trans Himalayan region with a flexible body one can easily achieve full range of movement and this can be really helpful for trekkers as well as trek leads. A good flexible will be an advantage while walking on trails , climbing and river crossing etc. Flexibility can be achieved by simple stretching, yoga etc.
Legs Strength : Body and Legs Strength is required to carry body weight as well as backpack while trekking in uneven multi terrains. Generally a good strength on legs works out good in any Trek. One can gain legs strength by doing simple Squats.
Balance : As well said a balanced mind and body gives out best in every condition and that too works in Himalayan treks as well.